| » Abelia floribunda | Mexican Abelia | AGM |
| » Abelia x grandiflora | Glossy Abelia | AGM |
 | » Abutilon 'Huntington Pink' | Flowering Maple |
 | » Abutilon 'Kentish Belle' | Flowering Maple | AGM |
 | » Abutilon pictum 'Thompsonii' | Flowering Maple |
 | » Abutilon vitifolium | Flowering Maple | AGM |
 | » Abutilon x hybridum 'Cascade Dawn' | Flowering Maple |
| » Acacia baileyana | Cootamundra Wattle | AGM |
 | » Acacia baileyana 'Purpurea' | Cootamundra Wattle | AGM |
 | » Acanthus 'Whitewater' | Bear's Breeches |
 | » Acanthus mollis | Bear's Breeches |
 | » Acanthus spinosus | Bear's Breeches | AGM |
| » Acer palmatum 'Sango Kaku' | Coral Bark Maple | AGM |
 | » Achillea 'Moonshine' | Yarrow | AGM |
 | » Achillea hybrid 'Pretty Belinda' | Yarrow | AGM |
| » Achillea millefolium 'Angelique' | Yarrow |
| » Achillea millefolium 'Cerise Queen' | Yarrow |
 | » Achillea millefolium 'Terra Cotta' | Yarrow |
 | » Achimenes 'Harry Williams' | Orchid Pansy |
 | » Achimenes 'Himalayan Orange' | Orchid Pansy |
 | » Achimenes 'Himalayan Purple' | Orchid Pansy |
 | » Achimenes 'Snow Princess' | Orchid Pansy |
 | » Achimenes pulcherrima | Orchid Pansy |
| » Aconitum 'Blue Lagoon' | Monkshood |
| » Aconitum 'Cloudy' | Monkshood |
| » Aconitum aff. episcopale | Climbing Monkshood |
| » Aconitum carmichaelii (fischeri) 'Arendsii' | Monkshood | AGM |
| » Aconitum carmichaelli 'Pink Sensation' | Monkshood |
| » Aconitum hemsleyanum | Climbing Monkshood |
| » Aconitum lamarckii | Yellow Monkshood |
| » Aconitum napellus | Monkshood |
| » Aconitum x cammarum 'Eleanor' | Monkshood |
 | » Aconitum x cammarum 'Stainless Steel' | Monkshood |
 | » Acorus gramineus 'Ogon' | Grassy-leaved Sweet Flag | GPP |
| » Actaea (Cimicifuga) matsumurae 'White Pearl' | Bugbane |
| » Actaea (Cimicifuga) simplex 'Atropurpurea' | Bugbane |
| » Actaea (Cimicifuga) simplex 'Black Negligee' | Bugbane | AGM,GPP |
| » Actaea (Cimicifuga) simplex 'Brunette' | Bugbane | AGM,GPP |
 | » Actaea (Cimicifuga) simplex 'Chocoholic' | Bugbane |
| » Actaea (Cimicifuga) simplex 'Hillside Black Beauty' | Bugbane |
| » Actaea (Cimicifuga) simplex 'James Compton' | Bugbane |
| » Actaea (Cimicifuga) simplex 'Pink Spike' | Bugbane |
 | » Adiantum aleuticum (syn. pedatum) | Maidenhair Fern | AGM,GPP |
 | » Aeonium arboreum 'Zwartkop' | Aeonium | AGM |
 | » Agapanthus 'Back in Black' | Lily-of-the-Nile |
 | » Agapanthus 'Black Buddha' | Lily-of-the-Nile |
| » Agapanthus 'Black Pantha' | Lily-of-the-Nile |
| » Agapanthus 'Headbourne Hybrids' | Lily-of-the-Nile |
| » Agapanthus 'Midnight Blue' | Lily-of-the-Nile |
| » Agapanthus 'Sea Foam' | Lily-of-the-Nile |
 | » Agapanthus 'Storm Cloud' | Lily-of-the-Nile |
| » Agapanthus 'Tinkerbell' | Lily-of-the-Nile |
| » Agastache 'Black Adder' | Anise Hyssop |
 | » Agastache 'Blue Fortune' | Anise Hyssop | AGM,GPP |
 | » Agastache 'Summer Fiesta' | Anise Hyssop |
 | » Agastache 'Summer Love' | Anise Hyssop |
 | » Agave 'Cornelius' | Century Plant |
 | » Agave 'Kissho Kan' | Century Plant |
 | » Agave 'Mr Ripple' | Century Plant |
| » Agave (Azul) | Maguey Azul |
 | » Agave americana | Century Plant | AGM |
| » Agave americana 'Marginata' | Century Plant | AGM |
 | » Agave americana 'Mediopicta Alba' | Century Plant | AGM |
 | » Agave attenuata 'Kara's Stripes' | Fox-tail Agave |
 | » Agave bracteosa 'Calamar' | Century Plant |
 | » Agave gentryi 'Jaws' | Century Plant |
 | » Agave montana 'Baccarat' | Century Plant |
 | » Agave parryi | Parry's Agave |
 | » Agave parryi 'Cream Spike' | Century Plant |
 | » Agave salmiana var. ferox 'Green Goblet' | Century Plant |
 | » Agave victoria-reginae 'Porcupine' | Century Plant | AGM |
| » Ajuga 'Sparkler' | Bugleweed |
| » Ajuga reptans 'Black Scallop' | Bugleweed |
 | » Ajuga reptans 'Blueberry Muffin' | Bugleweed |
| » Ajuga reptans 'Burgundy Glow' | Bugleweed |
 | » Ajuga reptans 'Catlin's Giant' | Bugleweed | AGM |
| » Ajuga reptans 'Golden Glow' | Bugleweed |
| » Ajuga reptans 'Golden Glow' | Bugleweed |
| » Ajuga reptans 'Party Colors' | Bugleweed |
| » Ajuga reptans 'Toffee Chip' | Bugleweed |
| » Ajuga x tenorii 'Chocolate Chip' | Bugleweed |
| » Akebia quinata | Chocolate Vine |
 | » Albizia julibrissin | Silk Tree | AGM |
| » Alcea rosea 'Fiesta Time' | Hollyhock |
| » Alcea rosea 'Nigra' | Hollyhock |
| » Alcea rosea 'Peaches 'n' Dreams' | Hollyhock |
| » Alchemilla erythropoda | Lady's Mantle | AGM |
 | » Alchemilla lithophila | Lady's Mantle |
| » Alchemilla alpina | Lady's Mantle |
| » Alchemilla ellenbeckii | Lady's Mantle | AGM |
 | » Alchemilla mollis | Lady's Mantle | AGM |
 | » Allium 'Globemaster' | Ornamental Onion | AGM |
| » Allium 'Ivory Queen' | |
 | » Allium 'Mount Everest' | |
| » Allium atropurpureum | Tumbleweed Onion |
 | » Allium caeruleum (azureum) | Ornamental Onion | AGM |
| » Allium cristophii | Star of Persia | AGM,GPP |
| » Allium giganteum | Giant Allium | AGM |
 | » Allium hollandicum 'Purple Sensation' | Ornamental Onion | AGM |
| » Allium karataviense | Turkestan Onion | AGM |
 | » Allium moly (luteum) | Golden Garlic |
| » Allium neapolitanum | Naples Onion |
| » Allium oreophilum 'Ostrowskianum' | Alpine Rosy Bells |
| » Allium schubertii | Tumbleweed Onion |
 | » Allium sphaerocephalon | Drumstick Onion |
 | » Alocasia macrorhizos | Upright Elephant Ears |
 | » Aloe polyphylla | Spiral Aloe |
| » Alstroemeria 'Glory of the Andes' | Peruvian Lily |
 | » Alstroemeria 'Jacqueline' | Peruvian Lily |
| » Alstroemeria 'Sweet Laura' | Peruvian Lily |
 | » Alstroemeria psittacina 'Variegata' | Parrot Lily |
 | » Amorphopallus bulbifer | Devil's Tongue |
 | » Amorphopallus bulbifer Northeast Indian Form | Devil's Tongue |
| » Amorphopallus nepalense | Devil's Tongue |
| » Amorphopallus rivieri 'Konjac' | Devil's Tongue |
 | » Amsonia illustris | Ozark Blue Star |
 | » Amsonia tabernaemontana var. salicifolia | Blue Star |
| » Anchusa azurea 'Loddon Royalist' | Italian Alkanet | AGM |
| » Anemome multifida | Windflower |
| » Anemome multifida 'Rubra' | Windflower |
| » Anemone crispa 'Lady Gilmour' | Japanese Anemone |
 | » Anemone hupehensis var. japonica 'Pamina' | Japanese Anemone | AGM |
| » Anemone hupehensis var. japonica 'Party Dress' | Japanese Anemone |
| » Anemone hupehensis var. japonica 'Queen Charlotte' | Japanese Anemone |
 | » Anemone nemerosa | Wood Anemone | AGM,GPP |
| » Anemone sylvestris 'Elise Feldman' | Snowdrop Anemone |
 | » Anemone x hybrida 'Honorine Jobert' | Japanese Anemone | AGM |
 | » Anemone x hybrida 'September Charm' | Japanese Anemone | AGM |
| » Angelica gigas | |
 | » Anthemis marschalliana | Marshall Chamomile |
| » Anthemis tinctoria 'Kelwayii' | Golden Marguerite |
| » Anthemis tinctoria 'Sauce Hollandaise' | Golden Marguerite |
| » Anthemis tinctoria Charme | Marguerite |
 | » Anthriscus sylvestris 'Ravenswing' | Cow Parsley |
 | » Antirrhinum braun-blanquetti | Perennial Snapdragon |
| » Aquilegia 'Leprechaun Gold' | Columbine |
 | » Aquilegia 'Lime Frost' | Columbine |
| » Aquilegia 'McKana Giants' | Columbine |
| » Aquilegia 'Winky Mix' | Columbine |
 | » Aquilegia 'Woodside Gold' | Columbine |
 | » Aquilegia canadensis 'Little Lanterns' | Columbine |
| » Araucaria araucana | Monkey Puzzle Tree |
 | » Arisaema album | Cobra Lily |
 | » Arisaema barnesii | Cobra Lily |
 | » Arisaema concinnum | Cobra Lily |
 | » Arisaema consanguineum | Himalayan Cobra Lily |
 | » Arisaema consanguineum 'Poseidon' | Himalayan Cobra Lily |
 | » Arisaema consanguineum 'The Perfect Wave' | Himalayan Cobra Lily |
 | » Arisaema costatum | Cobra Lily |
 | » Arisaema flavum | Yellow Cobra Lily |
 | » Arisaema galeatum | Cobra Lily |
 | » Arisaema griffithii | Griffith's Cobra Lily |
 | » Arisaema griffithii var. pradhanii | Pradhan's Cobra Lily |
 | » Arisaema intermedium | Cobra Lily |
 | » Arisaema iyoanum var. nakanum | Cobra Lily |
 | » Arisaema jacquemontii | Cobra Lily |
 | » Arisaema kishidae Patterned Selection | Cobra Lily |
 | » Arisaema kiushianum | Cobra Lily |
 | » Arisaema nepenthoides | Cobra Lily |
| » Arisaema propinquum | Cobra Lily |
 | » Arisaema ringens | Cobra Lily |
 | » Arisaema sazensoo | Cobra Lily |
 | » Arisaema serratum Patterned Selection | Cobra Lily |
 | » Arisaema serratum var. mayebarae | Cobra Lily |
 | » Arisaema sikokianum Patterned Selection | Cobra Lily |
 | » Arisaema speciosum | Cobra Lily |
 | » Arisaema speciosum var. magnificum | Cobra Lily |
| » Arisaema speciosum var. mirabile | Cobra Lily |
 | » Arisaema thunbergii | Cobra Lily |
 | » Arisaema thunbergii ssp. urashima | Cobra Lily |
 | » Arisaema tortuosum | Cobra Lily |
 | » Arisaema tortuosum var. helleborifolium | Whipcord Cobra Lily |
| » Arisaema triphyllum | Jack-in-the-Pulpit |
 | » Arisaema utile | Cobra Lily |
| » Aristolochia macrophylla (A. durior) | Dutchman's Pipe |
 | » Armeria maritima 'Nifty Thrifty' | Sea Thrift |
| » Artemisia lactiflora 'Guizho' | White Mugwort |
 | » Arum italicum | Painted Arum | AGM |
 | » Arum italicum 'Winter White' | Italian Arum |
| » Aruncus aethusifolius | Goat's Beard | AGM,GPP |
| » Aruncus dioicus | Giant Goat's Beard | AGM |
| » Aruncus dioicus 'Kneiffii' | Goat's Beard |
| » Arundo donax | Giant Reed |
 | » Arundo donax 'Versicolor' | Giant Reed |
| » Asarum caudatum | Wild Ginger | GPP |
 | » Asarum europaeum | Asarabacca | GPP |
| » Asarum splendens | Chinese Wild Ginger | GPP |
| » Asclepias incarnata 'Ice Ballet' | Swamp Milkweed |
| » Asclepias incarnata 'Soul Mate' | Swamp Milkweed |
 | » Asclepias tuberosa | Butterfly Milkweed |
| » Asplenium (Phyllitis) scolopendrium | Hart's Tongue Fern | AGM,GPP |
 | » Astelia chathamica 'Silver Spear' | Chatham Island Astelia | AGM |
 | » Aster cordifolius 'Avondale' | Wood Aster | GPP |
 | » Aster divaricatus 'Eastern Star' | White Wood Aster | GPP |
 | » Aster tataricus 'Jindai' | Tatarian Daisy | GPP |
| » Aster dumosus 'Schneekissen' | Bushy Aster |
 | » Aster lateriflorus 'Lady in Black' | Calico Aster |
| » Aster lateriflorus 'Prince' | Calico Aster | GPP |
| » Aster tongolensis 'Spring Blue' | Alpine Aster |
| » Aster tongolensis 'Wartburg Star' | Alpine Aster |
| » Aster x frikartii 'Monch' | Aster | AGM |
| » Astilbe japonica 'Montgomery' | False Spiraea |
| » Astilbe chinensis 'Raspberry Pink' | False Spiraea |
| » Astilbe chinensis 'Vision in Red' | False Spiraea |
| » Astilbe chinensis 'Visions' | False Spiraea |
| » Astilbe simplicifolia 'Key West' | False Spiraea |
| » Astilbe simplicifolia 'Sprite' | False Spiraea | AGM |
| » Astilbe thunbergii 'Ostrich Plume/Straussenfeder | False Spiraea | AGM |
| » Astilbe x arendsii 'Bumalda' | False Spiraea |
| » Astilbe x arendsii 'Fanal' | False Spiraea | AGM |
 | » Astilboides tabularis | Shieldleaf Rodgersia |
| » Astrantia 'Bloody Mary' | Masterwort |
| » Astrantia major 'Abbey Road' | Masterwort |
| » Astrantia major 'Bo-Ann' | Masterwort |
 | » Astrantia major 'Magnum Blush' | Masterwort |
 | » Astrantia major 'Moulin Rouge' | Masterwort |
 | » Astrantia major 'Ruby Wedding' | Masterwort |
 | » Astrantia major 'Sunningdale Variegated' | Masterwort | AGM |
| » Athyrium 'Ocean's Fury' | Crested Painted Fern |
| » Athyrium filix-femina | Lady Fern | AGM |
| » Athyrium filix-femina var. angustum 'Lady in Red' | Lady Fern |
 | » Athyrium nipponicum 'Burgundy Lace' | Japanese Painted Fern | AGM |
| » Athyrium nipponicum 'Pictum' | Japanese Painted Fern | AGM |
 | » Athyrium otophorum | Eared Lady Fern | AGM,GPP |
| » Athyrium x 'Branford Beauty' | Hybrid Fern |
 | » Athyrium x 'Ghost' | Ghost Fern |
| » Baptisia 'Solar Flare Prairieblues' | False Indigo |
| » Baptisia 'Twilite Prairieblues' | False Indigo |
| » Baptisia australis | Blue False Indigo | AGM |
| » Baptisia lactea (leucantha) | False Indigo |
 | » Beesia deltophylla | Beesia |
 | » Begonia 'Metallic Mist' | Hardy Begonia | AGM |
| » Begonia 'Silver Splendor' | Hardy Begonia | AGM |
 | » Begonia grandis ssp. evansiana | Hardy Begonia | AGM |
| » Bergenia 'Bressingham White' | Heartleaf Bergenia | AGM |
| » Bergenia 'Winterglut' | Bergenia |
 | » Bergenia cordifolia | Heartleaf Bergenia | GPP |
| » Bergenia cordifolia 'Bressingham Ruby' | Heartleaf Bergenia |
 | » Beschorneria 'Ding Dong' | False Red Agave |
| » Billardiera longiflora | Appleberry | AGM |
 | » Blechnum spicant | Deer Fern | AGM,GPP |
| » Bletilla 'Penway Dragon' | Chinese Ground Orchid |
 | » Bletilla formosana | Taiwanese Ground Orchid |
 | » Bletilla ochracea | Chinese Ground Orchid |
| » Bletilla striata | Chinese Ground Orchid |
| » Bletilla striata 'Alba' | Chinese Ground Orchid |
| » Brugmansia 'Snowbank' | Angel's Trumpet |
| » Brunnera macrophylla 'Langtrees' | Siberian Bugloss |
 | » Brunnera macrophylla | Siberian Bugloss | AGM |
| » Brunnera macrophylla 'Diane's Gold' | Siberian Bugloss |
| » Brunnera macrophylla 'Emerald Mist' | Siberian Bugloss |
 | » Brunnera macrophylla 'Hadspen Cream' | Siberian Bugloss | AGM |
 | » Brunnera macrophylla 'Jack Frost' | Siberian Bugloss | GPP |
| » Brunnera macrophylla 'King's Ransom' | Siberian Bugloss |
 | » Brunnera macrophylla 'Looking Glass' | Heartleaf Alkanet |
| » Brunnera macrophylla 'Silver Wings' | Siberian Bugloss |
 | » Brunnera macrophylla 'Spring Yellow' | Siberian Bugloss |
| » Brunnera macrophylla 'Variegata' | Siberian Bugloss | AGM |
| » Buddleia alternifolia 'Argentea' | Beauty Bush | AGM |
| » Buddleia davidii 'Asian Moon' | Butterfly Bush | AGM |
| » Buddleia davidii 'Bicolor' | Butterfly Bush | AGM |
 | » Buddleia davidii 'Black Knight' | Butterfly Bush | AGM |
 | » Buddleia davidii 'Dartmoor' | Butterfly Bush | AGM |
| » Buddleia davidii 'Purple Prince' | Butterfly Bush |
| » Buddleia davidii 'Royal Red' | Butterfly Bush |
| » Buddleia davidii 'Santana' | Butterfly Bush | AGM |
| » Buddleia fallowiana var. alba | Butterfly Bush | AGM |
| » Buddleia globosa | Orange Ball Tree | AGM |
 | » Buddleia x weyeriana 'Honeycomb' | Butterfly Bush |
| » Buphthalmum salicifolium | Yellow Ox-Eye Daisy |
| » Calamagrostis x acutiflora 'Karl Foerster' | Feather Reed Grass |
| » Calamagrostis x acutiflora 'Overdam' | Feather Reed Grass |
| » Calamintha grandiflora 'Variegata' | Calamint |
 | » Calanthe Kozu Hybrids (Red) | Hardy Calanthe Orchid |
 | » Calanthe Takane Hybrids | Hardy Calanthe Orchid |
 | » Calanthe discolor | Hardy Calanthe Orchid |
 | » Calanthe sieboldii | Hardy Calanthe Orchid |
 | » Calanthe tricarinata | Hardy Calanthe Orchid |
| » Callicarpa bodinieri var. giraldii 'Profusion' | Beauty Berry | AGM,GPP |
 | » Callirhoe involucrata | Wine Cups |
| » Callistemon violaceus 'Island Ruby' | Purple Bottlebrush |
 | » Calopsis paniculata | Calopsis |
| » Camassia cusickii | Cusick's Camas |
 | » Camassia leichtlinii | Great Camas | AGM |
 | » Camassia quamash | Camas Lily | GPP |
 | » Campanula 'Purple Sensation' | Bellflower |
 | » Campanula 'Sarastro' | Bellflower |
| » Campanula lactiflora 'Loddon Anna' | Milky Bellflower | AGM |
 | » Campanula cochleariifolia 'Elizabeth Oliver' | Fairies Thimbles |
| » Campanula persicifolia 'La Belle' | Peachleaf Bellflower |
 | » Campanula poscharskyana 'Blue Waterfall' | Serbian Bellflower | AGM |
 | » Campanula punctata 'Plum Wine' | Spotted Bellflower |
| » Campanula trachelium 'Bernice' | Nettle-Leaved Bellflower |
 | » Canna 'Pretoria/Bengal Tiger' | Canna Lily | AGM |
| » Canna 'Red Futurity' | Canna Lily |
| » Canna 'Stuttgart' | Canna Lily |
| » Canna 'Sunburst Pink' | Canna Lily |
 | » Canna coccinea 'Bonfire' | Canna Lily |
 | » Canna trinervia variegata 'Nirvana' | Canna Lily |
 | » Cardiocrinum giganteum | Giant Himalayan Lily |
 | » Cardiocrinum giganteum Indian Selections | Giant Himalayan Lily |
| » Carex 'Ice Dance' | | GPP |
 | » Carex appalachia | Appalachian Sedge |
| » Carex buchananii 'Red Rooster' | Leatherleaf Sedge |
 | » Carex elata 'Aurea' | Bowles Golden Sedge | AGM,GPP |
| » Carex flacca (syn. glauca) 'Blue Zinger' | Blue Sedge | AGM |
| » Carex oshimensis 'Evergold' | Striped Weeping Sedge | AGM,GPP |
| » Carex pendula | Drooping Sedge |
 | » Carex platyphylla | Silver Sedge |
 | » Carpenteria californica 'Elizabeth' | Tree Anemone | AGM |
 | » Caryopteris divaricata 'Pink Illumination' | Bluebeard |
 | » Caryopteris divaricata 'Snow Fairy' | Bluebeard |
| » Caryopteris x clandonensis 'Hint of Gold' | Bluebeard |
| » Caryopteris x clandonensis 'White Surprise' | Bluebeard |
| » Caryopteris x clandonensis 'Worcester Gold' | Bluebeard |
 | » Cautleya gracilis (lutea) | Hardy Shade Ginger |
| » Cautleya spicata | Hardy Shade Ginger |
| » Ceanothus 'Dark Star' | California Lilac | AGM |
| » Ceanothus 'Joyce Coulter' | California Lilac |
| » Ceanothus 'Julia Phelps' | California Lilac |
| » Ceanothus griseus var. horizontalis 'Diamond Heights' | Carmel California Lilac |
| » Ceanothus impressus 'Vandenberg' | Santa Barbara California Lilac |
 | » Ceanothus thyrsiflorus 'Victoria' | California Lilac | GPP |
| » Ceanothus thyrsiflorus var. thyrsiflorus 'Variegata' | California Lilac |
| » Centaurea macrocephala | Globe Centaurea |
 | » Centaurea montana | Bachelor's Button |
 | » Centaurea montana 'Amethyst in Snow' | Bachelor's Button |
 | » Centaurea montana 'Black Sprite' | Bachelor's Button |
 | » Centranthus ruber | Valerian |
| » Centranthus ruber 'Alba' | Valerian |
| » Cephalaria gigantea | Giant Scabious |
| » Ceratostigma griffithii | Burmese Plumbago |
| » Ceratostigma plumbaginoides | Blue Leadwort |
 | » Ceratostigma willmotianum | Chinese Plumbago | AGM |
| » Chamaerops humilis | Mediterranean Fan Palm | AGM |
 | » Chasmanthium latifolium 'River Mist' | Northern Sea Oats |
 | » Chelone lyonii | Pink Turtlehead |
 | » Chelone obliqua | Rose Turtlehead |
 | » Chionanthus virginicus | Fringe Tree | GPP |
| » Choisya 'Aztec Pearl' | Mexican Mock Orange | AGM |
 | » Choisya ternata | Mexican Mock Orange | AGM |
| » Choisya ternata 'Sundance' | Mexican Mock Orange | AGM |
 | » Chondropetalum tectorum | Cape Rush |
| » Cistus creticus ssp. incanus | Rock Rose |
| » Cistus crispus | Rock Rose |
| » Cistus ladanifer 'Blanche' | Rock Rose |
| » Cistus x argenteus 'Silver Pink' | Rock Rose |
| » Cistus x pulverulentus
'Sunset' | Rock Rose | AGM |
| » Cistus x purpureus 'Alan Fradd' | Rock Rose |
| » Clematis 'Jackmanii' | Clematis | AGM |
 | » Clematis Various Cultivars | Clematis |
 | » Clematis (Evison Collection) 'Avant Garde' | Clematis |
 | » Clematis (Evison Collection) 'Crystal Fountain' | Clematis |
 | » Clematis (Evison Collection) 'Empress' | Clematis |
 | » Clematis (Evison Collection) 'Franziska Maria' | Clematis |
 | » Clematis (Evison Collection) 'Josephine' | Clematis | AGM |
 | » Clematis (Evison Collection) 'Petit Faucon' | Clematis | AGM |
 | » Clematis (Kivistik Collection) 'Minister' | Clematis |
 | » Clematis (Kivistik Collection) 'Piilu' | Clematis |
 | » Clematis (Kivistik Collection) 'Ruutel' | Clematis |
 | » Clematis (Kivistik Collection) 'Silmakivi' | Clematis |
 | » Clematis alpina 'Stolwijk's Gold' | Clematis |
| » Clematis armandii | Evergreen Clematis |
| » Clematis armandii 'Apple Blossom' | Evergreen Clematis | AGM |
| » Clematis cirrhosa var. balearica | Evergreen Clematis |
 | » Clematis heracleifolia 'China Purple' | Clematis |
| » Clematis montana 'Grandiflora' | Anemone Clematis | AGM |
| » Clematis montana 'Rubens' | Anemone Clematis |
 | » Clematis recta 'Purpurea' | Purple-Leaved Clematis |
| » Clematis terniflora (paniculata) | Sweet Autumn Clematis |
 | » Clematis texensis 'Gravetye Beauty' | Clematis |
| » Clematis texensis 'Princess Diana' | Clematis | AGM |
 | » Clematis x jouiniana 'Mrs Robert Brydon' | Clematis |
 | » Clivia miniata | Fire Lily | AGM |
 | » Colocasia esculenta 'Black Magic' | Taro |
| » Colocasia esculenta 'Illustris' | Taro |
| » Convallaria majalis | Lily-of-the-Valley | AGM |
| » Convallaria majalis 'Rosea' | Lily-of-the-Valley |
| » Coreopsis 'Autumn Blush' | Tickseed |
| » Coreopsis 'Ruby Frost' | Tickseed |
| » Coreopsis 'Snowberry' | Tickseed |
 | » Coreopsis 'Tequila Sunrise' | Tickseed |
| » Coreopsis Big Bang 'Cosmic Eye' | Tickseed |
| » Coreopsis Big Bang 'Full Moon' | Tickseed |
| » Coreopsis Big Bang 'Galaxy' | Tickseed |
| » Coreopsis Big Bang 'Redshift' | Tickseed |
| » Coreopsis auriculata 'Zamfir' | Tickseed |
| » Coreopsis tripteris 'Lightning Flash' | Tickseed |
| » Coreopsis verticillata 'American Dream' | Thread-Leaved Tickseed |
| » Coreopsis verticillata 'Moonbeam' | Thread-Leaved Tickseed | AGM |
| » Coreopsis verticillata 'Sienna Sunset' | Thread Leaf Coreopsis |
| » Coreopsis verticillata 'Zagreb' | Thread-Leaved Tickseed | AGM |
| » Coreopsis x 'Limerock Passion' | Tickseed |
 | » Coreopsis x 'Limerock Ruby' | Tickseed |
| » Cornus alba 'Ivory Halo' | Red-Barked Dogwood |
| » Cornus canadensis | Bunch Berry |
 | » Cornus sericea (stolonifera) 'Sunshine' | Red Osier Dogwood |
| » Cortaderia selloana 'Pumila' | Dwarf Pampas Grass | AGM |
| » Corydalis 'Canary Feathers' | Corydalis |
| » Corydalis elata | Corydalis |
 | » Corydalis flexuosa 'China Blue' | Corydalis |
 | » Corydalis flexuosa 'Pere David' | Corydalis |
| » Corydalis flexuosa 'Purple Leaf' | |
 | » Corydalis ochroleuca | Corydalis |
 | » Corydalis quantmeyerana 'Chocolate Star' | Corydalis |
| » Corydalis sempervirens | Rock Harlequin |
 | » Corylopsis pauciflora | Buttercup Winter Hazel | AGM,GPP |
| » Corylopsis spicata | Spike Winter Hazel | GPP |
 | » Corylopsis spicata 'Aurea' | Spike Winter Hazel | GPP |
| » Cosmos atrosanguineus | Chocolate Cosmos |
| » Cotinus coggygria 'Grace' | Smoke Tree | GPP |
| » Cotinus coggygria 'Royal Purple' | Smoke Bush | AGM,GPP |
| » Cotinus coggygria 'Young Lady' | Smoke Bush |
| » Crambe cordifolia | Colewort | AGM |
 | » Crinum 'Ellen Bosanquet' | Crinum Lily |
 | » Crinum amoenum | Crinum Lily |
 | » Crinum moorei 'Album' | Natal Lily |
| » Crinum x powellii | Crinum Lily | AGM |
 | » Crocosmia 'Emily MacKenzie' | Montbretia |
| » Crocosmia 'Severn Sunrise' | Montebretia | AGM,GPP |
 | » Crocosmia x crocomiiflora 'Lucifer' | Montebretia | AGM,GPP |
| » Cyclamen coum | Persian Violet | AGM,GPP |
| » Cyclamen coum 'Something Magic' | Persian Violet | AGM,GPP |
 | » Cyclamen hederifolium | Ivyleaf Cyclamen | AGM,GPP |
| » Cyclamen hederifolium 'SilverMe Pink' | Ivyleaf Cyclamen |
| » Cyclamen hederifolium 'SilverMe White' | Ivyleaf Cyclamen |
 | » Cynara cardunculus | Cardoon | AGM |
 | » Cypripedium flavum | Yellow Lady's Slipper |
 | » Cypripedium formosanum | Formosa Lady's Slipper |
 | » Cypripedium parviflorum var. pubescens | Yellow Lady's Slipper |
 | » Cypripedium reginae | Showy Lady's Slipper |
 | » Cyrtanthus mackenii 'Himalayan Pink' | Ifafa Lily |
 | » Cyrtanthus mackenii 'Himalayan Red' | Ifafa Lily |
| » Cyrtanthus mackenii 'Himalayan White' | Ifafa Lily |
 | » Dactylorhiza maculata | Heath Spotted Orchid |
 | » Dactylorhiza praetermissa | Southern Marsh Orchid |
| » Dahlia 'Vancouver' | Dahlia | AGM |
| » Dahlia Bishop of Leicester | Dahlia | AGM |
| » Dahlia Bishop of Oxford | Dahlia | AGM |
| » Dahlia Bishop of York | Dahlia | AGM |
 | » Dahlia Bishop Series | Dahlia | AGM |
 | » Dahlia Chic Series | Dahlia |
| » Dahlia Happy Single Series | Dahlia |
 | » Daphne genkwa | Lilac Daphne |
| » Daphne odora | Winter Daphne | AGM,GPP |
 | » Daphne odora 'Aureomarginata' | Winter Daphne | AGM,GPP |
 | » Daphne odora 'Mae Jima' | Winter Daphne | AGM,GPP |
| » Daphne tangutica | Daphne | AGM |
| » Daphne x burkwoodii 'Briggs Moonlight' | Daphne |
 | » Daphne x burkwoodii 'Carol Mackie' | Daphne | GPP |
| » Daphne x burkwoodii 'Somerset' | Daphne | AGM,GPP |
| » Daphne x houtteana | Daphne |
 | » Daphne x medfordensis 'Lawrence Crocker' | Daphne | AGM,GPP |
 | » Daphne x transatlantica 'Eternal Fragrance' | Daphne | GPP |
 | » Daphne x transatlantica 'Summer Ice' | Daphne |
| » Darmera peltata | Umbrella Plant | AGM |
| » Delosperma floribundum 'Starburst' | Ice Plant |
 | » Delphinium 'Red Caroline' | Larkspur |
| » Delphinium New Millenium Series | Delphinium |
| » Delphinium grandiflorum 'Summer Cloud' | Delphinium |
| » Delphinium nudicaule 'Laurin' | Larkspur |
| » Deschampsia caespitosa 'Northern Lights' | Tufted Hair Grass |
| » Dianthus 'First Love' | Pinks |
| » Dianthus 'Apple Slice' | Pinks |
| » Dianthus 'Black Cherry Wild' | Pinks |
| » Dianthus 'Coconut Punch' | Pinks |
| » Dianthus 'Dragon Fruit' | Pinks |
| » Dianthus 'Pomegranate Kiss' | Pinks |
| » Dianthus 'Raspberry Swirl' | Pinks |
| » Dianthus 'Strawberry Sorbet' | Pinks |
 | » Dianthus 'Wicked Witch' | Cheddar Pink |
| » Dianthus barbatus 'Heart Attack' | Sweet William |
| » Dianthus barbatus var. nigrescens 'Sooty' | Sweet William |
| » Dianthus grataniopolitanus 'Bath's Pink' | Cheddar Pink |
 | » Dianthus gratianopolitanus 'Firewitch' | Cheddar Pink |
 | » Dianthus plumarius 'Fragrant White' | Cottage Pink |
| » Dicentra 'Bacchanal' | Bleeding Heart | AGM |
| » Dicentra 'Burning Hearts' | Bleeding Heart |
| » Dicentra 'Candy Hearts' | Bleeding Heart |
| » Dicentra 'Ivory Hearts' | Bleeding Heart |
 | » Dicentra 'King of Hearts' | Bleeding Heart |
 | » Dicentra cucullaria | Dutchman's Breeches |
 | » Dicentra formosa 'Langtrees' | Bleeding Heart | AGM |
 | » Dicentra scandens | Climbing Bleeding Heart |
 | » Dicentra spectabilis | Bleeding Heart | AGM |
| » Dicentra spectabilis 'Alba' | Bleeding Heart | AGM |
 | » Dicentra spectabilis 'Goldheart' | Bleeding Heart | GPP |
| » Dicentra spectabilis 'Valentine' | Bleeding Heart | AGM |
 | » Dichroa febrifuga | Evergreen Hydrangea |
 | » Dicksonia antarctica | Tasmanian Tree Fern | AGM |
| » Dierama pulcherrimum | Angel's Fishing Rod |
| » Digitalis obscura Goldcrest | Rusty Foxglove |
 | » Diphylleia grayi | Asian Umbrella Leaf |
 | » Disanthus cercidifolius | Redbud Hazel | AGM,GPP |
 | » Disporum sessile 'Cricket' | Fairy Bells |
 | » Disporum sessile 'Tweetie' | Fairy Bells |
 | » Disporum sessile 'Variegata' | Fairy Bells |
 | » Disporum smilacinum 'Kino Tsukasa' | Fairy Bells |
 | » Disporum smilacinum 'Kogane Tsuki' | Fairy Bells |
| » Dodecatheon jeffreyi | Sierra Shooting Star |
| » Dodecatheon meadia | Shooting Star | AGM |
| » Doronicum pardalianches (cordatum) 'Little Leo' | Leopard's Bane |
 | » Dracunculus vulgaris | Dragon Lily |
| » Dryopteris erythrosora 'Brilliance' | Autumn Fern | AGM,GPP |
| » Eccremocarpus scaber | Chilean Glory Flower |
| » Echeveria 'Black Knight' | Mexican Hen and Chicks | AGM |
 | » Echeveria 'Black Prince' | Mexican Hen and Chicks |
 | » Echeveria 'Blue Curls' | Mexican Hen and Chicks |
 | » Echeveria 'Perle von Nurnberg' | Mexican Hen and Chicks | AGM |
 | » Echeveria (LV) | Mexican Hen and Chicks |
 | » Echeveria Various Cultivars | Mexican Hen & Chicks |
 | » Echeveria runyonii 'Topsy Turvy' | Mexican Hen and Chicks | AGM |
 | » Echinacea 'Amazing Dream' | Purple Coneflower |
| » Echinacea 'Coral Reef' | Coneflower |
 | » Echinacea 'Daydream' | Coneflower |
| » Echinacea 'Firebird' | Coneflower |
| » Echinacea 'Flame Thrower' | Coneflower |
 | » Echinacea 'Gum Drop' | Coneflower |
 | » Echinacea 'Heavenly Dream' | Coneflower |
 | » Echinacea 'Hot Lava' | Coneflower |
 | » Echinacea 'Hot Papaya' | Coneflower |
 | » Echinacea 'Hot Summer' | Coneflower |
| » Echinacea 'Mac 'n' Cheese' | Coneflower |
 | » Echinacea 'Maui Sunshine' | Coneflower |
| » Echinacea 'Pink Poodle' | Coneflower |
 | » Echinacea 'Secret Passion' | Coneflower |
 | » Echinacea 'Tangerine Dream' | Coneflower |
 | » Echinacea 'Tiki Torch' | Coneflower |
| » Echinacea 'Tomato Soup' | Coneflower |
| » Echinacea Big Sky 'After Midnight' | Coneflower |
 | » Echinacea Big Sky 'Sunrise' | Coneflower |
 | » Echinacea Big Sky 'Sunset' | Coneflower |
 | » Echinacea Big Sky 'Twighlight' | Coneflower |
 | » Echinacea Big Sky Harvest Moon / 'Matthew Saul' | Coneflower |
| » Echinacea Big Sky Summer Sky / 'Katie Saul' | Coneflower |
 | » Echinacea Big Sky Sundown / 'Evan Saul' | Coneflower |
 | » Echinacea Crazy Pink / 'Adam Saul' | Coneflower |
| » Echinacea paradoxa | Yellow Coneflower |
| » Echinacea purpurea 'Alaska' | White Swan Coneflower |
 | » Echinacea purpurea 'Coconut Lime' | Coneflower |
| » Echinacea purpurea 'Double Decker' / 'Doppleganger' | Purple Coneflower |
 | » Echinacea purpurea 'Fancy Frills' | Coneflower |
| » Echinacea purpurea 'Fatal Attraction' | Purple Coneflower |
 | » Echinacea purpurea 'Green Envy' | Not-So-Purple Coneflower |
| » Echinacea purpurea 'Green Jewel' | Coneflower |
| » Echinacea purpurea 'Jade' | White Coneflower |
| » Echinacea purpurea 'Kim's Knee High' | Purple Coneflower |
 | » Echinacea purpurea 'Little Giant' | Purple Coneflower |
| » Echinacea purpurea 'Magnus' | Cone Flower | AGM |
| » Echinacea purpurea 'Meringue' | Purple Coneflower |
| » Echinacea purpurea 'Milkshake' | Purple Coneflower |
| » Echinacea purpurea 'Pica Bella' | Coneflower |
| » Echinacea purpurea 'Pink Double Delight' | Purple Coneflower |
 | » Echinacea purpurea 'Razzmatazz' | Purple Coneflower |
| » Echinacea purpurea 'Red Knee High' | Purple Coneflower |
| » Echinacea purpurea 'Ruby Star' | Coneflower |
 | » Echinacea purpurea 'Vintage Wine' | Purple Coneflower |
 | » Echinacea purpurea 'White Swan' | White Swan Coneflower |
| » Echinacea tennesseensis 'Rocky Top Hybrids' | Tennessee Coneflower |
| » Echinops ritro 'Sea Stone' | Small Globe Thistle | AGM |
 | » Echinops ritro 'Veitch's Blue' | Small Globe Thistle | AGM |
| » Echinops ruthenicus 'Platinum Blue' | Globe Thistle | AGM |
 | » Echinops setifer (sphaerocephalus) 'Arctic Glow' | Globe Thistle |
| » Edgeworthia chrysantha 'Gold Rush' | Golden Paperbush |
 | » Elegia capensis | Horsetail Restio |
 | » Ensete ventricosum 'Maurellii' | Abyssinian Banana | AGM |
 | » Eomecon chionantha | Snow Poppy |
| » Epimedium grandiflorum 'Lilafee' | Barrenwort |
 | » Epimedium grandiflorum 'Yubae' | Barrenwort | GPP |
| » Epimedium myrianthum | Barrenwort |
| » Epimedium perralchicum 'Fröhnleiten' | Barrenwort | AGM,GPP |
| » Epimedium x rubrum | Barrenwort | AGM,GPP |
| » Epimedium x versicolor 'Sulphureum' | Barrenwort | AGM,GPP |
| » Epimedium x warleyense 'Orangekönigin | Barrenwort | GPP |
| » Epimedium x youngianum 'Merlin' | Barrenwort |
| » Epimedium x youngianum 'Niveum' | Barrenwort | AGM |
 | » Epimedium x youngianum 'Roseum' | Barrenwort |
 | » Epipactis thunbergii | Persimmon Orchid |
| » Eremurus 'Pinocchio' | Foxtail Lily | AGM |
| » Eremurus robustus | Foxtail Lily | AGM |
| » Eremurus stenophyllus | Foxtail Lily | AGM |
| » Eremurus x isabellinus 'Cleopatra' | Foxtail Lily | AGM |
 | » Erigeron 'Darkest of All' | Fleabane | AGM |
| » Erigeron karvinskianus | Daisy or Mexican Fleabane | AGM |
| » Eryngium 'Big Blue' | Moroccan Sea Holly |
 | » Eryngium 'Sapphire Blue' | Moroccan Sea Holly |
| » Eryngium alpinum | Alpine Sea Holly | AGM |
| » Eryngium bourgatii | Mediterranean Sea Holly |
 | » Eryngium eburneum | Sea Holly |
| » Eryngium giganteum | Miss Willmott's Ghost | AGM |
| » Eryngium pandanifolium | Sea Holly |
 | » Eryngium planum 'Amazing Jackpot' | Sea Holly |
 | » Eryngium planum 'Hellas' | Sea Holly |
| » Eryngium planum 'Jade Frost' | Sea Holly |
 | » Eryngium planum 'Paradise Jackpot' | Sea Holly |
 | » Eryngium planum 'Sunny Jackpot' | Sea Holly |
| » Eryngium variifolium | Moroccan Sea Holly |
 | » Eryngium yuccifolium | Rattlesnake Master |
 | » Erysimum 'Bowles Mauve' | Wallflower | AGM |
 | » Erysimum 'Bowles Variegated' | |
| » Erysimum 'Fragrant Star' | Wallflower |
 | » Erysimum 'Fragrant Sunshine' | Wallflower | AGM |
| » Erythronium 'Pagoda' | Trout Lily | GPP |
| » Erythronium californicum 'White Beauty' | California Fawn Lily | GPP |
| » Eucalyptus species | Eucalyptus |
| » Eucharis amazonica | Amazon Lily |
 | » Eucomis 'Freckles' | Pineapple Lily |
| » Eucomis autumnalis | Pineapple Lily | AGM |
| » Eucomis bicolor | Pineapple Lily | AGM |
 | » Eucomis comosa 'Sparkling Burgundy' | Pineapple Lily | GPP |
 | » Eucomis vandermerwei 'Octopus' | Pineapple Lily | AGM |
| » Eucryphia x intermedia | Eucryphia |
| » Euonymus alatus 'Compactus' | Burning Bush | AGM,GPP |
| » Euonymus alatus Chicago Fire / 'Timber Creek' | Burning Bush |
 | » Euonymus fortunei 'Wolong Ghost' | Wintercreeper |
| » Eupatorium 'Phantom' | Joe-Pye Weed |
 | » Eupatorium dubium 'Baby Joe' | Joe-Pye Weed |
 | » Eupatorium dubium 'Little Joe' | Joe-Pye Weed |
| » Eupatorium perfoliatum | Boneset |
 | » Eupatorium rugosum 'Chocolate' | Snakeroot | AGM,GPP |
| » Euphorbia 'Blue Haze' | Spurge |
 | » Euphorbia 'Glacier Blue' | Spurge |
 | » Euphorbia 'Shorty' | Spurge |
| » Euphorbia Blackbird / 'Nothowlee' | Spurge |
| » Euphorbia Excalibur / 'Froeup' | Spurge | AGM |
 | » Euphorbia amygdaloides 'Ruby Glow' | Wood Spurge |
 | » Euphorbia amygdaloides var. robbiae | Mrs Rob's Bonnet | AGM |
| » Euphorbia characias 'Portuguese Velvet' | Evergreen Spurge | AGM |
 | » Euphorbia characias 'Tasmanian Tiger' | Evergreen Spurge |
 | » Euphorbia characias ssp. wulfenii | Evergreen Spurge | AGM,GPP |
| » Euphorbia griffithii 'Dixter' | Spurge | AGM |
 | » Euphorbia griffithii 'Fireglow' | Spurge |
 | » Euphorbia myrsinites | Donkey Tail Spurge | AGM |
| » Euphorbia polychroma | Cushion Spurge |
 | » Euphorbia polychroma 'Bonfire' | Cushion Spurge |
| » Euphorbia polychroma 'First Blush' | Cushion Spurge |
 | » Euphorbia x martinii 'Ascot Rainbow' | Cushion Spurge |
 | » Euphorbia x martinii 'Rudolph' | Cushion Spurge |
 | » Fallopia japonica 'Variegata' | Japanese Fleece Flower |
 | » Fascicularia bicolor | Sun Bromeliad |
 | » Fatshedera lizei 'Lemon & Lime' / 'Annemieke' | Tree Ivy | AGM |
| » Fatsia japonica | Japanese Fatsia | AGM,GPP |
| » Fatsia japonica 'Spider's Web' | Japanese Fatsia | AGM,GPP |
| » Fatsia japonica 'Variegata' | Japanese Fatsia | AGM,GPP |
 | » Festuca glauca 'Elijah Blue' | Blue Fescue |
| » Festuca valesiaca var. glaucantha | Volga Fescue |
| » Filipendula rubra | Queen of the Prairie |
| » Filipendula ulmaria 'Aurea' | Meadowsweet |
| » Filipendula vulgaris 'Plena' | Dropwort |
 | » Foeniculum vulgare 'Purpurascens' | Bronze fennel |
| » Forsythia 'Fiesta' | Forsythia |
| » Forsythia viridissima var. koreana
'Kumson' | Forsythia |
| » Fothergilla gardenii 'Blue Shadow' | Bottlebrush |
| » Fragaria 'Lipstick' | Strawberry |
| » Fragaria 'Pink Panda' | Strawberry |
 | » Fremontodendron 'California Glory' | California Flannel Bush | AGM |
| » Fuchsia Hardy Varieties | Fuchsia |
 | » Fuchsia magellanica 'Alba' | Fuchsia |
| » Fuchsia magellanica 'Aurea' | Fuchsia | AGM |
| » Fuchsia magellanica 'Riccartoni' | Fuchsia |
 | » Fuchsia magellanica 'Windcliff Flurry' | Fuchsia |
| » Gaillardia 'The Sun' | Blanket Flower |
| » Gaillardia aristata 'Amber Wheels' | Blanket Flower |
 | » Gaillardia aristata 'Arizona Sun' | Blanket Flower |
| » Gaillardia aristata 'Tokajer' | Blanket Flower |
 | » Gaillardia x grandiflora 'Fanfare' | Blanket Flower |
 | » Gaillardia x grandiflora 'Oranges and Lemons' | Blanket Flower |
| » Gaillardia x grandiflora Commotion 'Frenzy' | Blanket Flower |
| » Gaillardia x grandiflora Commotion 'Tizzy' | Blanket Flower |
| » Gaillardia x grandiflora Gallo Dark Bicolor | Blanket Flower |
| » Gaillardia x grandiflora Gallo Peach | Blanket Flower |
| » Gaillardia x grandiflora Gallo Red | Blanket Flower |
| » Gaillardia x grandiflora Gallo Yellow | Blanket Flower |
 | » Galium odoratum | Sweet Woodruff |
 | » Gardenia jasminoides 'Kleim's Hardy' | Gardenia |
| » Gardenia jasminoides 'Summer Snow' | Gardenia |
| » Gaultheria procumbens | Wintergreen | AGM |
 | » Gaultheria shallon | Salal |
 | » Gaura lindheimeri 'Corrie's Gold' | Butterfly Gaura |
 | » Gaura lindheimeri 'Crimson Butterflies' | Butterfly Gaura |
| » Gaura lindheimeri 'Passionate Pink' | Butterfly Gaura |
| » Gaura lindheimeri 'Siskiyou Pink' | Butterfly Gaura |
| » Gaura lindheimeri 'Whirling Butterfies' | Butterfly Gaura |
| » Gazania linearis 'Colorado Gold' | Gazania |
 | » Gelsemium sempervirens 'Margarita' | Carolina Jessamine | AGM |
| » Gentiana acaulis | Gentian | AGM |
 | » Gentiana asclepiadea | Willow Gentian | AGM,GPP |
 | » Gentiana makinoi 'Royal Blue' | Gentian |
| » Gentiana septemfida var. lagodechiana | Crested Gentian | AGM |
 | » Geranium 'Ann Folkard' | Cranesbill | AGM,GPP |
 | » Geranium 'Blue Sunrise' | Cranesbill | AGM |
 | » Geranium 'Bob's Blunder' | Cranesbill |
 | » Geranium 'Brookside' | Cranesbill | AGM,GPP |
 | » Geranium 'Cheryl's Shadow' | Cranesbill |
| » Geranium 'Crystal Lake' | Cranesbill |
| » Geranium 'Dragon Heart' | Cranesbill |
 | » Geranium 'Jolly Bee' | Cranesbill | AGM |
 | » Geranium 'Orkney Cherry' | Cranesbill |
| » Geranium 'Patricia' | Cranesbill | AGM,GPP |
 | » Geranium 'Perfect Storm' | Cranesbill |
| » Geranium 'Pink Penny' | Cranesbill |
 | » Geranium 'Red Admiral' | Cranesbill |
 | » Geranium 'Rozanne' | Cranesbill | AGM,GPP |
 | » Geranium 'Salome' | Cranesbill | GPP |
 | » Geranium 'Sandrine' | Cranesbill | GPP |
 | » Geranium 'Starman' | Cranesbill |
| » Geranium 'Stephanie' | Cranesbill |
 | » Geranium 'Sweet Heidy' | Cranesbill |
| » Geranium 'Tiny Monster' | Cranesbill |
 | » Geranium cinereum 'Ballerina' | Cranesbill | AGM |
| » Geranium cinereum 'Carol' | Cranesbill |
| » Geranium cinereum 'Lawrence Flatman' | Cranesbill | GPP |
 | » Geranium cinereum 'Memories' | Cranesbill |
 | » Geranium cinereum 'Purple Pillow' | Cranesbill |
 | » Geranium himalayense 'Plenum' | Himalayan Cranesbill |
 | » Geranium macrorrhizum 'Bevan's Variety' | Bigroot Cranesbill | AGM |
 | » Geranium macrorrhizum 'Ingwersen's Variety' | Bigroot Cranesbill | AGM |
| » Geranium maculatum 'Elizabeth Ann' | Cranesbill | AGM |
| » Geranium maculatum 'Espresso' | Cranesbill |
 | » Geranium phaeum 'Margaret Wilson' | Mourning Widow |
 | » Geranium phaeum 'Samobor' | Mourning Widow |
| » Geranium phaeum 'Springtime' | Mourning Widow |
 | » Geranium pratense 'Double Jewel' | Cranesbill |
 | » Geranium pratense 'Summer Skies' | Cranesbill |
 | » Geranium psilostemon | Cranesbill | AGM |
 | » Geranium renardii | Cranesbill | AGM |
| » Geranium sanguineum 'Album' | Cranesbill | AGM |
| » Geranium sanguineum 'New Hampshire Purple' | Cranesbill |
| » Geranium sanguineum var. striatum | Bloody Cranesbill | AGM |
| » Geranium sinense 'Orion' | Cranesbill |
| » Geranium wallichianum 'Buxton's Variety' | Cranesbill | AGM |
| » Geranium x cantabrigiense 'Biokovo' | Crabesbill |
 | » Geranium x magnificum | Showy cranesbill | AGM |
 | » Geum 'Mango Lassi' | Avens |
 | » Geum coccineum 'Borisii' | Red Avens |
| » Geum coccineum 'Eos' | Red Avens |
| » Geum rivale 'Album' | Water Avens |
 | » Geum rivale 'Leonard's Variety' | Water Avens |
 | » Gillenia (Porteranthus) trifoliata | Bowman's Root | AGM,GPP |
 | » Gladiolus papilio | Butterfly Gladiolus |
 | » Glaucidium palmatum | Japanese Wood Poppy | AGM |
 | » Globba schomburgkii | Golden Dancing Ladies |
 | » Globba winitii 'Mount Everest' | Dancing Ladies |
 | » Grevillea victoriae | Royal Grevillea |
| » Gunnera magellanica | Creeping Gunnera |
 | » Gunnera manicata | Dinosaur Food | AGM |
| » Gunnera tinctoria | Dinosaur Food | AGM |
| » Hakonechloa macra 'Albo Striata' | Japanese Hakone Grass | GPP |
 | » Hakonechloa macra 'All Gold' | Japanese Hakone Grass |
 | » Hakonechloa macra 'Aureola' | Japanese Forest Grass | AGM,GPP |
| » Hakonechloa macra 'Naomi' | Japanese Forest Grass | AGM,GPP |
| » Hakonechloa macra 'Nicolas' | Japanese Forest Grass | AGM,GPP |
 | » Hakonechloa macra Fubuki 'Briform' | Japanese Forest Grass | AGM,GPP |
| » Hebe 'Autumn Glory' | Hebe |
| » Hebe 'Blue Gem' | Hebe |
| » Hebe 'Mrs Winder' | Hebe | AGM |
| » Hebe 'Oratia Beauty' | Hebe | AGM |
| » Hebe 'Pretty 'n' Pink' | Hebe | AGM |
| » Hebe 'Shiraz' | Hebe |
| » Hebe Various Cultivars | Hebe |
 | » Hebe anomala | Hebe |
| » Hebe hulkeana (syn. ochracea) 'James Stirling' | Whipcord Hebe | AGM |
| » Hebe pimeleoides 'Quicksilver' | Hebe | AGM |
| » Hebe pinquifolia 'Pageii' | Hebe | AGM |
| » Hebe salicifolia | Hebe |
| » Hedychium 'Gold Spot' | Hardy Ginger |
 | » Hedychium 'Pink Princess' | Hardy Ginger |
| » Hedychium coccineum 'Sonya' | Hardy Ginger |
 | » Hedychium coccineum 'Tara' | Hardy Ginger | AGM |
 | » Hedychium coccineum (aurantiacum) | Hardy Ginger | AGM |
 | » Hedychium coronarium | Butterfly Ginger |
 | » Hedychium densiflorum | Hardy Ginger |
| » Hedychium densiflorum 'Assam Orange' | Hardy Ginger |
 | » Hedychium ellipticum | Hardy Ginger |
| » Hedychium flavum | Hardy Ginger |
 | » Hedychium gardnerianum | Hardy Kahili Ginger | AGM |
| » Hedychium gracile | Hardy Ginger |
 | » Hedychium greenii | Hardy Ginger |
 | » Hedychium griffithianum | Hardy Ginger |
| » Hedychium spicatum | Hardy Ginger |
 | » Hedychium thyrsiforme | Hardy Pincushion Ginger |
| » Helenium 'Moerheim Beauty' | Sneezeweed | AGM,GPP |
| » Helenium 'Sahin's Early Flowerer' | Sneezeweed | AGM |
| » Helenium hoopesii | Sneezeweed |
 | » Helianthus 'Lemon Queen' | Perennial Sunflower | AGM |
| » Helianthus angustifolius 'Low Down' | Dwarf Sunflower |
| » Helictotrichon sempervirens | Blue Oat Grass | AGM,GPP |
| » Heliopsis helianthoides 'Loraine Sunshine' | False Sunflower |
 | » Helleborus argutifolius | Corsican Hellebore | AGM,GPP |
| » Helleborus argutifolius 'Pacific Frost' | Corsican Hellebore |
 | » Helleborus argutifolius 'Silver Lace' | Corsican Hellebore | AGM,GPP |
| » Helleborus atrorubens | Lenten Rose |
| » Helleborus foetidus | Stinking Hellebore | AGM,GPP |
| » Helleborus foetidus Piccadilly Strain | Stinking Hellebore | AGM,GPP |
 | » Helleborus foetidus Red Silver Strain | Stinking Hellebore | AGM,GPP |
 | » Helleborus foetidus Wester Flisk Strain | Hellebore | AGM,GPP |
 | » Helleborus lividus Pink Marble | Lenten Rose | AGM |
| » Helleborus lividus White Marble | Lenten Rose | AGM |
 | » Helleborus niger 'Double Fantasy' | Christmas Rose |
| » Helleborus niger 'Double Fashion' | Christmas Rose |
 | » Helleborus niger 'HGC Jacob' | Christmas Rose |
 | » Helleborus niger 'HGC Josef Lemper' | Christmas Rose |
 | » Helleborus niger 'Praecox' | Christmas Rose |
| » Helleborus odorus | Lenten Rose |
 | » Helleborus purpurascens | Lenten Rose |
 | » Helleborus torquatus | Lenten Rose |
 | » Helleborus viridis | Lenten Rose |
| » Helleborus x ballardiae 'HGC Cinnamon Snow' | Hellebore |
| » Helleborus x ballardiae 'HGC Moonlit Marble' | Hellebore |
 | » Helleborus x ballardiae 'HGC Pink Frost' | Hellebore |
| » Helleborus x ericsmithii 'HGC Champion' | Hellebore |
 | » Helleborus x ericsmithii 'HGC Silvermoon' | Hellebore |
| » Helleborus x ericsmithii 'HGC Winter's Bliss' | Hellebore |
| » Helleborus x ericsmithii 'HGC Winter's Song' | Hellebore |
| » Helleborus x ericsmithii 'Pink Beauty' | Hellebore |
| » Helleborus x ericsmithii 'Pirouette' | Hellebore |
| » Helleborus x ericsmithii 'Winter Moonbeam' | Hellebore |
 | » Helleborus x ericsmithii 'Winter Sunshine' | Hellebore |
| » Helleborus x ericsmithii Vancouver Medallion | Hellebore |
| » Helleborus x hybridus | Lenten Rose | GPP |
| » Helleborus x hybridus 'Gold Finch' | Lenten Rose | GPP |
| » Helleborus x hybridus 'Tutu' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Black' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Cassis Red' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Elegance Snow' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Elegance White' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Pale Pink' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Picotee' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Pink Bicolor' | Lenten Rose | GPP |
| » Helleborus x hybridus 'WD Pure White' | Lenten Rose | GPP |
| » Helleborus x hybridus Ashwood Garden Hybrids | Lenten Rose | GPP |
| » Helleborus x hybridus Ballard Hybrids | Lenten Rose | GPP |
 | » Helleborus x hybridus Brandywine Strain | Lenten Rose | GPP |
| » Helleborus x hybridus Double Queen Strain | Lenten Rose | GPP |
| » Helleborus x hybridus Double Vision Strain | Lenten Rose | GPP |
| » Helleborus x hybridus Harvey Double Hybrids | Lenten Rose | GPP |
 | » Helleborus x hybridus Heronswood Doubles | Lenten Rose | GPP |
| » Helleborus x hybridus Heronswood Singles | Lenten Rose | GPP |
 | » Helleborus x hybridus HW 'Kingston Cardinal' | Lenten Rose | GPP |
 | » Helleborus x hybridus Lady Series Blue Lady | Lenten Rose | GPP |
| » Helleborus x hybridus Lady Series Metallic Blue Lady | Lenten Rose | GPP |
| » Helleborus x hybridus Lady Series Pink Lady | Lenten Rose | GPP |
| » Helleborus x hybridus Lady Series Red Lady | Lenten Rose | GPP |
| » Helleborus x hybridus Lady Series Yellow Lady | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Apricot Shades | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Bicolor | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Black Shades | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Doubles | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Plum Shades | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Red Shades | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Slate Shades | Lenten Rose | GPP |
| » Helleborus x hybridus Mardi Gras Yellow Shades | Lenten Rose | GPP |
 | » Helleborus x hybridus Mrs Betty Ranicar | Lenten Rose | GPP |
 | » Helleborus x hybridus PK Southern Belles | Lenten Rose | GPP |
| » Helleborus x hybridus PK Variegated Strain | Lenten Rose | GPP |
| » Helleborus x hybridus Royal Heritage Strain | Lenten Rose | GPP |
| » Helleborus x hybridus Spring Promise 'Bridget' | Lenten Rose | GPP |
| » Helleborus x hybridus Spring Promise 'Emma' | Lenten Rose | GPP |
| » Helleborus x hybridus Spring Promise 'Mary Lou' | Lenten Rose | GPP |
| » Helleborus x hybridus Spring Promise 'Sandra' | Lenten Rose | GPP |
| » Helleborus x hybridus Walberton's Rosemary | Lenten Rose | GPP |
| » Helleborus x hybridus Winter Thrillers Grape Galaxy | Lenten Rose | GPP |
| » Helleborus x hybridus Winter Thrillers Pink Parachutes | Lenten Rose | GPP |
| » Helleborus x hybridus Winter Thrillers Red Racer | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Amber Gem | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Apricot Blush | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Berry Swirl | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Black Diamond | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Brushstrokes | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Cherry Blossom | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Cotton Candy | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Golden Lotus | Lenten Rose | GPP |
 | » Helleborus x hybridus WJ Golden Sunrise | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Harlequin Gem | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Jade Star | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Jade Tiger | Lenten Rose | GPP |
| » Helleborus x hybridus WJ London Fog | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Onyx Odyssey | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Painted | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Painted Doubles | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Peppermint Ice | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Regal Ruffles | Lenten Rose | GPP |
| » Helleborus x hybridus WJ Sparkling Diamond | Lenten Rose | GPP |
| » Helleborus x nigercors 'Green Heron' | Hellebore |
 | » Helleborus x nigercors 'HGC Green Corsican' | Hellebore |
| » Helleborus x nigercors 'Honeyhill Joy' | Hellebore | AGM,GPP |
| » Helleborus x nigercors 'Snow Love' | Hellebore |
| » Helleborus x nigercors 'White Beauty' | Hellebore |
 | » Helleborus x nigersmithii Ivory Prince | Lenten Rose |
| » Helleborus x sternii 'Hot Flash' | Corsican Hellebore | AGM,GPP |
 | » Helleborus x sternii 'Silver Dollar' | Lenten Rose |
| » Helleborus x sternii Blackthorn Group | Lenten Rose |
 | » Heloniopsis orientalis | Oriental Swamp Pink |
 | » Hemerocallis 'Black Stockings' | Daylily |
| » Hemerocallis 'Catherine Woodbury' | Daylily |
| » Hemerocallis 'Edge of Darkness' | Daylily |
| » Hemerocallis 'Fooled Me' | Daylily |
| » Hemerocallis 'Happy Returns' | Daylily |
| » Hemerocallis 'Hyperion' | Daylily |
| » Hemerocallis 'Longfield's Twins' | Daylily |
| » Hemerocallis 'Moonlit Masquerade' | Daylily |
| » Hemerocallis 'Mystery Black' | Daylily |
| » Hemerocallis 'Purple D'Oro' | Daylily |
| » Hemerocallis 'Purple Water' | Daylily |
| » Hemerocallis 'Rosy Returns' | Daylily |
| » Hemerocallis 'Ruby Stella' | Daylily |
| » Hemerocallis 'Stella d'Oro' | Daylily |
| » Hemerocallis 'Yellow Submarine' | Daylily |
 | » Hemerocallis 'You Angel You' | Daylily |
| » Hepatica nobilis | Liver Leaf | AGM |
 | » Hepatica transsilvanica 'Blue Jewel' | Liverleaf | AGM |
 | » Heuchera 'Autumn Leaves' | Coral Bells |
 | » Heuchera 'Berry Smoothie' | Coral Bells |
 | » Heuchera 'Blackout' | Coral Bells |
| » Heuchera 'Cherry Cola' | Coral Bells |
 | » Heuchera 'Electra' | Coral Bells |
 | » Heuchera 'Electric Lime' | Coral Bells |
 | » Heuchera 'Fire Chief' | Coral Bells |
 | » Heuchera 'Georgia Peach' | Coral Bells |
| » Heuchera 'Ginger Ale' | Coral Bells |
 | » Heuchera 'Ginger Peach' | Coral Bells |
 | » Heuchera 'Havana' | Coral Bells |
| » Heuchera 'Lime Marmalade' | Coral Bells |
 | » Heuchera 'Lipstick' | Coral Bells |
 | » Heuchera 'Mahogany' | Coral Bells |
 | » Heuchera 'Marmalade' | Coral Bells |
 | » Heuchera 'Midas Touch' | Coral Bells |
 | » Heuchera 'Midnight Bayou' | Coral Bells |
 | » Heuchera 'Midnight Rose' | Coral Bells |
 | » Heuchera 'Milan' | Coral Bells |
 | » Heuchera 'Mint Frost' | Coral Bells |
 | » Heuchera 'Mint Julep' | Coral Bells |
 | » Heuchera 'Mysteria' | Coral Bells |
 | » Heuchera 'Obsidian' | Coral Bells |
| » Heuchera 'Peach Flambe' | Coral Bells |
 | » Heuchera 'Plum Pudding' | Coral Bells |
 | » Heuchera 'Plum Royale' | Coral Bells |
 | » Heuchera 'Sashay' | Coral Bells |
 | » Heuchera 'Shanghai' | Coral Bells |
 | » Heuchera 'Southern Comfort' | Coral Bells |
| » Heuchera 'Sugar Plum' | Coral Bells |
 | » Heuchera villosa 'Caramel' | Coral Bells |
 | » Heucherella 'Brass Lantern' | Foamy Bells |
 | » Heucherella 'Golden Zebra' | Foamy Bells |
 | » Heucherella 'Gunsmoke' | Foamy Bells |
 | » Heucherella 'Solar Power' | Foamy Bells |
 | » Heucherella 'Stoplight' | Foamy Bells |
 | » Heucherella 'Sweet Tea' | Foamy Bells |
 | » Heucherella 'Tapestry' | Foamy Bells |
| » Hibiscus x hybrida 'Moy Grande' | Perennial Hibiscus |
| » Hibiscus x moscheutos 'Crimson Wonder' | Perennial Hibiscus |
 | » Hibiscus x moscheutos 'Kopper King' | Perennial Hibiscus |
| » Hibiscus x moscheutos 'Plum Crazy' | Perennial Hibiscus |
 | » Hippeastrelia 'Durga Pradhan' | Hippeastrelia |
| » Hippeastrum 'Mrs. Garfield' | Variegated Amaryllis |
| » Hippeastrum papilio | Butterfly Amaryllis | AGM |
| » Hosta 'Aquamarine' | Plantain Lily |
 | » Hosta 'Bridegroom' | Plantain Lily |
 | » Hosta 'Brother Stefan' | Plantain Lily |
 | » Hosta 'Corkscrew' | Plantain Lily |
 | » Hosta 'Dancing Queen' | Plantain Lily |
 | » Hosta 'Deja Blu' | Plantain Lily |
| » Hosta 'Fireworks' | Plantain Lily |
 | » Hosta 'Flemish Sky' | Plantain Lily |
 | » Hosta 'Golden Waffles' | Plantain Lily |
| » Hosta 'Great Expectations' | Plantain Lily |
| » Hosta 'Guacamole' | Plantain Lily |
 | » Hosta 'Hacksaw' | Plantain Lily |
| » Hosta 'Hadspen Blue' | Plantain Lily |
| » Hosta 'Honeybells' | Plantain Lily | AGM |
| » Hosta 'Independence' | Plantain Lily |
| » Hosta 'Komodo Dragon' | Plantain Lily |
 | » Hosta 'Komodo Dragon' | Plantain Lily |
| » Hosta 'Krossa Regal' | Plantain Lily | AGM |
| » Hosta 'Minuteman' | Plantain Lily |
| » Hosta 'One Man's Treasure' | Plantain Lily |
 | » Hosta 'Parhelion' | Plantain Lily |
 | » Hosta 'Praying Hands' | Plantain Lily |
 | » Hosta 'Purple Heart' | Plantain Lily |
| » Hosta 'Queen of the Seas' | Plantain Lily |
 | » Hosta 'Rainforest Sunrise' | Plantain Lily |
| » Hosta 'Raspberry Sundae' | Plantain Lily |
| » Hosta 'Red Hot Poker' | Plantain Lily |
| » Hosta 'Red October' | Plantain Lily |
| » Hosta 'Stained Glass' | Plantain Lily |
| » Hosta 'Striptease' | Plantain Lily |
 | » Hosta 'Sugar and Spice' | Plantain Lily |
 | » Hosta 'Sum & Substance' | Plantain Lily | AGM,GPP |
 | » Hosta 'Sum of All' | Plantain Lily |
| » Hosta 'T-Rex' | Plantain Lily |
| » Hosta 'Thunderbolt' | Plantain Lily |
| » Hosta 'Titanic' | Plantain Lily |
 | » Hosta 'White Dove' | Plantain Lily |
| » Hosta 'White Feather' | Plantain Lily |
 | » Hosta (Mini) 'Blue Mouse Ears' | Plantain Lily |
 | » Hosta (Mini) 'Chartreuse Wiggles' | Plantain Lily |
 | » Hosta (Mini) 'Cracker Crumbs' | Plantain Lily |
 | » Hosta (Mini) 'Dragon Tails' | Plantain Lily |
 | » Hosta (Mini) 'Green Eyes' | Plantain Lily |
 | » Hosta (Mini) 'Lakeside Babyface' | Plantain Lily |
 | » Hosta (Mini) 'Lakeside Downsized' | Plantain Lily |
 | » Hosta (Mini) 'Lakeside Rocky Top' | Plantain Lily |
| » Hosta (Mini) 'Little Jay' | Plantain Lily |
| » Hosta (Mini) 'Little Treasure' | Plantain Lily |
 | » Hosta (Mini) 'Masquerade' | Plantain Lily |
 | » Hosta (Mini) 'Mighty Mouse' | Plantain Lily |
 | » Hosta (Mini) 'Pandora's Box' | Plantain Lily |
 | » Hosta (Mini) 'Shade Parade' | Plantain Lily |
 | » Hosta (Mini) 'Sunlight Child' | Plantain Lily |
 | » Hosta (Mini) 'Winsome' | Plantain Lily |
 | » Hosta (Mini) 'X-Rated' | Plantain Lily |
| » Hosta fortunei 'Patriot' | Plantain Lily |
 | » Hosta kikutii 'Hyuga Urajiro' | Plantain Lily |
 | » Hosta plantaginea 'Aphrodite' | August Lily | AGM |
 | » Hosta plantaginea 'Diana Remembered' | August Lily | AGM |
 | » Hosta plantaginea 'Venus' | August Lily |
| » Hosta plantaginea var. grandiflora | August Lily | AGM |
 | » Hosta sieboldiana 'Elegans' | Plantain Lily |
 | » Hosta sieboldiana 'Frances Williams' | Plantain LIly |
| » Hosta tardiana 'Halcyon' | Plantain Lily | AGM |
| » Hosta tardiana 'June Fever' | Plantain Lily |
| » Hosta tardiana 'June' | Plantain Lily | AGM,GPP |
 | » Humulus lupulus 'Aureus' | Golden Hops | AGM,GPP |
| » Hydrangea anomala ssp. petiolaris | Climbing Hydrangea | AGM,GPP |
| » Hydrangea integrifolia | Evergreen Climbing Hydrangea | GPP |
 | » Hydrangea macrophylla 'Ayesha' | Hydrangea |
| » Hydrangea macrophylla 'Blaumeise' | Hydrangea |
| » Hydrangea macrophylla 'Domotoi' | Hydrangea |
| » Hydrangea macrophylla 'Enziandom' | Hydrangea |
| » Hydrangea macrophylla 'Harlequin' | Hydrangea |
| » Hydrangea macrophylla 'Hornli' | Hydrangea |
| » Hydrangea macrophylla 'Nachtigall' | Hydrangea |
| » Hydrangea macrophylla 'Nigra' | Hydrangea | AGM |
| » Hydrangea paniculata 'Kyushu' | Panicle Hydrangea | AGM |
 | » Hydrangea paniculata 'Limelight' | Panicle Hydrangea |
| » Hydrangea paniculata 'Quickfire' | Panicle Hydrangea |
| » Hydrangea quercifolia 'Snow Giant' | Oakleaf Hydrangea | AGM |
 | » Hydrangea seemannii | Evergreen Climbing Hydrangea |
| » Hydrangea serrata 'Amagi Amacha' | Hydrangea |
| » Hydrangea serrata 'Midoriboshi -Temari' | Hydrangea |
 | » Hydrangea serrata 'Miyama-yae-Murasaki' | Hydrangea |
 | » Iberis sempervirens 'Golden Candy' | Candy Tuft |
 | » Iberis sempervirens 'Little Gem' | Candy Tuft |
| » Impatiens omeiana | Perennial Impatiens |
 | » Imperata cylindrica 'Red Baron' | Japanese Blood Grass |
| » Incarvillea delavayi | Hardy Gloxinia |
 | » Incarvillea delavayi 'Bees Pink' | Hardy Gloxinia |
 | » Incarvillea delavayi 'Snowtop' | Hardy Gloxinia |
| » Inula racemosa 'Sonnenspeer' | Inula |
| » Iris germanica 'Before the Storm' | Bearded Iris |
| » Iris chrysographes 'Black Form' | Black Iris | AGM |
 | » Iris cristata | Crested Iris | AGM |
| » Iris ensata 'Azuma Kagami' | Japanese Iris |
| » Iris foetidissima | Gladwyn Iris | AGM |
| » Iris germanica 'Breakers' (Rebloomer) | Bearded Iris | AGM |
| » Iris germanica 'Clarence' (Rebloomer) | Bearded Iris |
| » Iris germanica 'Firebreather' | Bearded Iris |
| » Iris germanica 'Immortality' (Rebloomer) | Bearded Iris |
| » Iris germanica 'Superstition' | Bearded Iris | AGM |
| » Iris germanica 'Swingtown' | Bearded Iris |
 | » Iris louisiana 'Jack Attack' | Louisiana Iris |
 | » Iris pseudacorus | Yellow Flag | AGM |
| » Iris pseudacorus 'Berlin Tiger' | Yellow Flag | AGM |
| » Iris pseudacorus 'Holden's Child' | Yellow Flag | AGM |
| » Iris pseudacorus Pale Yellow Form | Yellow Flag | AGM |
 | » Iris pumila | Dwarf Bearded Iris |
| » Iris pumila 'Boo' | Dwarf Bearded Iris |
| » Iris pumila 'Cherry Garden' | Dwarf Bearded Iris |
| » Iris setosa | Arctic Iris | AGM |
| » Iris sibirica 'Butter and Sugar' | Siberian Iris | AGM |
| » Iris sibirica 'Caesar's Brother' | Siberian Iris |
| » Iris sibirica 'Dance Ballerina Dance' | Siberian Iris |
 | » Iris sibirica 'Grey Mist' | Siberian Iris |
 | » Iris sibirica 'Navy Brass' | Siberian Iris |
| » Iris sibirica 'Painted Desert' | Siberian Iris |
| » Iris sibirica 'Papillon' | Siberian Iris |
| » Iris sibirica 'Silver Edge' | Siberian Iris | AGM |
 | » Iris sibirica 'Temper Tantrum' | Siberian Iris | AGM |
| » Iris tectorum | Roof Iris |
| » Iris unguicularis | Winter Iris |
 | » Iris versicolor 'Gerald Darby' | Iris |
| » Jasminum mesnyi | Primrose Jasmine | AGM |
 | » Jasminum officinale 'Fiona Sunrise' | Summer Jasmine |
| » Jasminum officinale Grandiflorum | Jasmine | AGM |
 | » Jeffersonia dubia | Asian Twinleaf |
| » Kalmia latifolia Various Cultivars | Mountain Laurel |
 | » Kirengeshoma palmata | Yellow Waxbells | AGM |
 | » Knautia macedonica | Crimson Scabious |
| » Knautia macedonica 'Mars Midget' | Crimson Scabious |
| » Knautia macedonica 'Thunder and Lightning' | Crimson Scabious |
 | » Kniphofia 'Green Jade' | Red Hot Poker |
| » Kniphofia caulescens | Red Hot Poker | AGM |
| » Kniphofia hirsuta 'Traffic Lights' | Red Hot Poker |
 | » Kniphofia northiae | Broadleaf Poker | AGM |
| » Lathyrus latifolius | Everlasting sweetpea |
 | » Lathyrus vernus | Spring Vetchling | AGM |
| » Lavandula angustifolia 'Blue Cushion' | Lavender |
| » Lavandula angustifolia 'Coconut Ice' | Lavender |
 | » Lavandula angustifolia 'Hidcote' | Lavender | AGM |
| » Lavandula augustifolia 'Munstead' | Lavender |
 | » Lavandula stoechas 'Otto Quast' | Spanish Lavender |
 | » Lavandula stoechas 'Passione' | Spanish Lavender |
 | » Lavandula stoechas 'Pastel Dreams' | Lavender |
| » Lavandula x intermedia 'Fred Boutin' | Lavender |
 | » Lavatera olbia 'Lilac Lady' | Tree Mallow |
 | » Lavatera thuringiaca 'Red Rum' | Tree Mallow |
| » Lavatera x clementii 'Barnsley Baby' | Tree Mallow |
| » Lavatera x clementii 'Barnsley' | Tree Mallow |
 | » Lavatera x clementii 'Burgundy Wine' | Tree Mallow | AGM |
 | » Leonotis menthifolia 'Savannah Sunset' | Lion's Ear |
 | » Leucanthemum maximum 'Goldrausch' | Shasta Daisy |
| » Leucanthemum x superbum 'Alaska' | Shasta Daisy |
 | » Leucanthemum x superbum 'Banana Cream' | Shasta Daisy |
| » Leucanthemum x superbum 'Crazy Daisy' | Shasta Daisy |
| » Leucanthemum x superbum 'Fiona Coghill' | Shasta Daisy |
| » Leucanthemum x superbum 'Old Court' | Shasta Daisy |
| » Leucanthemum x superbum 'Snehurka' | Shasta Daisy |
 | » Leucosceptrum japonicum 'Golden Angel' | Japanese Shrub Mint |
 | » Leucosceptrum japonicum 'Mountain Madness' | Japanese Shrub Mint |
 | » Liatris spicata | Blazing Star |
| » Liatris spicata 'Kobold' | Blazing Star |
| » Liatris spicata Floristan White | Blazing Star |
 | » Libertia formosa | Showy Libertia |
| » Libertia grandiflora | New Zealand Iris |
 | » Libertia peregrinans | New Zealand Iris |
| » Ligularia 'Little Rocket' | Leopard Plant |
| » Ligularia 'The Rocket' | Leopard Plant | AGM |
 | » Ligularia dentata 'Britt-Marie Crawford' | Leopard Plant |
| » Ligularia dentata 'Desdemona' | Leopard Plant | AGM |
| » Ligularia dentata 'Othello' | Leopard Plant |
| » Ligularia przewalskii 'Dragon's Breath' | Leopard Plant |
| » Ligularia x hessei 'Little Lantern' | Leopard Plant |
| » Lilium 'Lady Alice' | Lily |
| » Lilium (Asiatic) 'Cappuccino' | Asiatic Lily |
 | » Lilium (Asiatic) 'Citronella' | Asiatic Lily |
 | » Lilium (Asiatic) 'Coral Sunrise' | Asiatic Lily |
 | » Lilium (Asiatic) 'Landini' | Asiatic Lily |
 | » Lilium (Asiatic) 'Red Strap' | Asiatic Lily |
 | » Lilium (Asiatic) 'Vermeer' | Asiatic Lily |
 | » Lilium (Oriental) 'Black Beauty' | Oriental Lily |
 | » Lilium (Oriental) 'Casa Blanca' | Oriental Lily | AGM |
| » Lilium (Oriental) 'Dizzy' | Oriental Lily |
 | » Lilium (Oriental) 'Golden Stargazer' | Oriental Lily |
| » Lilium (Oriental) 'Mona Lisa' | Oriental Lily |
 | » Lilium (Oriental) 'Montezuma' | Oriental Lily |
 | » Lilium (Oriental) 'Starfighter' | Oriental Lily |
 | » Lilium (Oriental) 'Stargazer' | Oriental Lily |
| » Lilium (Oriental) 'White Stargazer' | Oriental Lily |
 | » Lilium (Trumpet) 'African Queen' | Trumpet Lily | AGM |
| » Lilium (Trumpet) 'Emerald Temple' | Trumpet Lily |
| » Lilium (Trumpet) 'Golden Splendor' | Trumpet Lily | AGM |
| » Lilium (Trumpet) 'Pink Perfection' | Trumpet Lily | AGM |
| » Lilium henryi 'Alba' | Henry's Lily |
 | » Lilium lancifolium (tigrinum) 'Flore Pleno' | Double Tiger Lily |
 | » Lilium longiflorum 'Elegant Lady' | Easter Lily |
| » Lilium martagon | Martagon Lily | AGM |
 | » Lilium martagon var. album | Martagon Lily | AGM |
| » Lilium martagon var. rubrum | Martagon Lily | AGM |
 | » Lilium nepalense | Nepal Lily |
 | » Lilium philippinense | Philippine Lily |
| » Lilium pumilum (tenuifolium) | Coral Lily | AGM |
 | » Lilium regale | Regal Trumpet Lily | AGM |
| » Lilium speciosum 'Rubrum' | Red Japanese Lily |
| » Lilium wallichianum | Wallich's Lily |
| » Liriope muscari | Lilyturf | AGM |
 | » Liriope muscari 'Okina' | Frosted Monkey Grass |
| » Liriope muscari 'Variegata' | Lilyturf |
| » Lithodora diffusa 'Grace Ward' | Lithodora | AGM |
 | » Lobelia cardinalis 'Elm Fire' | Cardinal Flower |
| » Lobelia speciosa 'Fan Scarlet' | Cardinal Flower |
 | » Lobelia syphilitica | Great Blue Lobelia |
 | » Lobelia tupa | Devil's Tobacco |
 | » Lonicera periclymenum 'Graham Thomas' | Honeysuckle | AGM |
 | » Lonicera fragrantissima | Winter Honeysuckle |
 | » Lonicera japonica 'Halliana' | Hall's Honeysuckle | AGM |
 | » Lonicera japonica 'Repens Purpurea' | Honeysuckle | AGM |
| » Lonicera nitida 'Baggenson's Gold' | Boxleaf Honeysuckle | AGM,GPP |
| » Lonicera nitida 'Lemon Beauty' | Honeysuckle |
 | » Lonicera sempervirens 'John Clayton' | Coral Honeysuckle | AGM |
 | » Lonicera sempervirens 'Major Wheeler' | Coral Honeysuckle | AGM |
| » Lupinus 'Witchett' | Lupine |
| » Lychnis chalcedonica | Maltese Cross | AGM |
| » Lychnis coronaria | Rose campion | AGM |
| » Lychnis coronaria 'Gardener's World' | Rose Campion |
 | » Lychnis flos-cuculi plena 'Jenny' | Ragged Robin |
| » Lysichiton americanum | Skunk Cabbage |
| » Lysimachia atropurpurea 'Beaujolais' | Loosestrife |
| » Lysimachia ciliata 'Firecracker' | Yellow Loosestrife | AGM |
| » Lysimachia clethroides 'Geisha' | Gooseneck Loosestrife |
| » Lysimachia punctata 'Alexander' | Whorled Lysimachia |
| » Lysimachia punctata 'Golden Alexander' | Whorled Lysimachia |
 | » Macleaya cordata | Plume Poppy | AGM |
 | » Magnolia 'Butterflies' | Magnolia | AGM,GPP |
 | » Magnolia 'Randy' | Magnolia | AGM,GPP |
 | » Magnolia 'Susan' | Magnolia | AGM,GPP |
| » Magnolia sieboldii | Summer or Oyama Magnolia | AGM,GPP |
| » Mahonia aquifolium | Oregon Grape |
| » Mahonia japonica 'Hiemalis' | Mahonia |
 | » Manfreda virginica 'Spot' | Deciduous Agave |
 | » Matteucia struthiopteris | Ostrich Fern |
 | » Meconopsis 'Lingholm' | Himalayan Blue Poppy |
 | » Melianthus major | Peanut Butter Plant | AGM |
 | » Melianthus major 'Antonow's Blue' | Peanut Butter Plant | AGM |
 | » Michelia figo | Port Wine Magnolia | AGM,GPP |
 | » Milium effusum 'Aureum' | Wood Millet |
 | » Mimulus guttatus | Yellow Monkey Flower |
| » Miscanthus sinensis 'Adagio' | Maiden Grass |
 | » Miscanthus sinensis 'Gold Bar' | Maiden Grass |
| » Miscanthus sinensis 'Gracillimus' | Maiden Grass |
| » Miscanthus sinensis 'Graziella' | Maiden Grass |
| » Miscanthus sinensis 'Morning Light' | Maiden Grass | AGM,GPP |
 | » Miscanthus sinensis 'Purpurascens' | Flame Grass |
| » Miscanthus sinensis 'Rotsilber' | Maiden Grass |
| » Miscanthus sinensis var. condensatus 'Cosmopolitan' | Maiden Grass |
 | » Miscanthus x giganteus | Giant Miscanthus |
 | » Mitraria coccinea | Chilean Mitre Flower |
| » Molinia caerulea 'Skyracer' | Purple Moor Grass |
| » Monarda didyma 'Snow White' | Bergamot |
 | » Monarda didyma 'Gardenview Scarlet' | Bergamot | AGM |
| » Monarda didyma 'Jacob Cline' | Beebalm |
| » Monarda didyma 'Mahogany' | Beebalm |
| » Monarda didyma 'Marshall's Delight' | Beebalm | GPP |
| » Monarda didyma 'Violet Queen' | Beebalm |
 | » Muhlenbergia capillaris | Pink Muhly Grass |
 | » Mukdenia rossii 'Crimson Fans' | Mukdenia |
 | » Musa basjoo | Hardy Japanese Fibre Banana | AGM |
 | » Musa sikkimensis (hookeri) | Hardy Banana |
| » Nandina domestica | Heavenly Bamboo |
| » Nandina domestica 'Filamentosa' | Heavenly Bamboo |
| » Nandina domestica 'Fire Power' | Heavenly Bamboo | AGM |
| » Nandina domestica 'Gulf Stream' | Heavenly Bamboo | GPP |
| » Nandina domestica 'Harbour Dwarf' | Heavenly Bamboo |
| » Nandina domestica 'Moon Bay' | Heavenly Bamboo | GPP |
| » Nandina domestica 'Moyer's Red' | Heavenly Bamboo |
| » Nandina domestica 'Plum Passion' | Heavenly Bamboo |
| » Nandina domestica 'Royal Princess' | Heavenly Bamboo |
| » Nandina domestica 'Sienna Sunrise' | Heavenly Bamboo |
| » Nandina domestica 'Umpqua Chief' | Heavenly Bamboo |
| » Nectaroscordum (Allium) siculum (bulgaricum) | Sicilian Honey Garlic |
| » Nepeta 'Six Hills Giant' | Catnip |
 | » Nepeta racemosa 'Walker's Low' | Persian Catmint | AGM,GPP |
| » Nepeta x faassenii 'Dawn to Dusk' | Catnip |
| » Nerine bowdenii | Guernsey Lily |
| » new | |
| » Nipponanthemum nipponicum | Nippon Daisy |
| » Olearia macrodonta | New Zealand Holly | AGM |
| » Ophiopogon jaburan 'Vittatus' | Variegated Mondo Grass |
| » Ophiopogon planiscapus 'Nigrescens' | Black Mondo Grass | AGM,GPP |
| » Opuntia fragilis | Fragile Prickly Pear |
| » Opuntia imbricata | Tree Cholla |
| » Opuntia leptocaulis | Christmas Cholla |
| » Origanum 'Kent Beauty' | Ornamental Oregano |
 | » Origanum vulgare 'Aureum' | Golden Oregano | AGM |
| » Osmanthus delavayi | Sweet Olive | AGM,GPP |
| » Osmanthus x burkwoodii | Burkwood Osmanthus | AGM,GPP |
| » Osmunda cinnamomea
| Cinnamon Fern | AGM |
 | » Osmunda regalis 'Purpurascens' | Royal Fern | AGM,GPP |
| » Oxalis deppei 'Iron Cross' | False Shamrock |
| » Oxalis oregana | Redwood Sorrell |
 | » Oxalis triangularis | False Shamrock |
| » Paeonia lactiflora 'Dancing Butterflies' | Peony |
| » Paeonia lactiflora 'Do Tell' | Peony |
| » Paeonia lactiflora 'Early Scout' | Peony |
| » Paeonia lactiflora 'Honey Gold' | Peony |
| » Paeonia lactiflora 'Immaculée' | Peony |
| » Paeonia lactiflora 'Karl Rosenfield' | Peony |
| » Paeonia lactiflora 'Lotus Queen' | Peony |
| » Paeonia lactiflora 'Nymphe' | Peony |
| » Paeonia lactiflora 'Primevère' | Peony |
| » Paeonia lactiflora 'Sarah Bernhardt' | Peony | AGM |
| » Paeonia lactiflora 'Scarlett O'Hara' | Peony |
| » Paeonia lactiflora 'Tom Eckhardt' | Peony |
 | » Paeonia lutea var. ludlowii | Tibetan Tree Peony | AGM |
| » Paeonia suffruticosa var. rockii | Tree Peony |
 | » Paeonia suffruticosa Various Cultivars | Tree Peony |
| » Paeonia tenuifolia 'Itoba' | Fernleaf Peony |
 | » Paeonia tenuifolia 'Rubra Flora Plena' | Fernleaf Peony |
| » Panicum virgatum 'Heavy Metal' | |
 | » Panicum virgatum 'RR1' Ruby Ribbons | Switch Grass |
| » Panicum virgatum 'Shenandoah' | Switch Grass | GPP |
| » Papaver orientalis 'Princess Victoria Louise' | Oriental Poppy |
| » Pardancanda norrisii | Candylily |
 | » Paris polyphylla | Paris |
| » Parthenocissus quinquefolia Star Showers 'Monham' | Virginia Creeper |
 | » Passiflora 'Lavender Lady' | Passion Flower |
 | » Passiflora caerulea | Blue Passion Flower | AGM |
| » Passiflora caerulea 'Constance Elliott' | White Passion Flower |
 | » Passiflora caerulea 'Select' | Blue Passion Flower | AGM |
 | » Passiflora quadrangularis | Giant Granadilla | AGM |
| » Pennisetum alopecuroides 'Hameln' | Dwarf Fountain Grass |
| » Pennisetum alopecuroides 'Moudry' | Black Fountain Grass |
| » Pennisetum orientale 'Karley Rose' | Fountain Grass |
 | » Pennisetum purpureum 'Prince' | Napier Grass | AGM |
 | » Pennisetum purpureum 'Princess' | Napier Grass | AGM |
 | » Pennisetum setaceum 'Fireworks' | Purple Fountain Grass | AGM |
| » Pennisetum setaceum 'Fireworks' | Purple Fountain Grass | AGM |
| » Pennisetum setaceum 'Rubrum' | Purple Fountain Grass | AGM |
| » Penstemon 'Alice Hindley' | Beard Tongue | AGM |
| » Penstemon 'Blackbird' | Beard Tongue |
 | » Penstemon 'Blueberry Taffy' | Penstemon |
 | » Penstemon 'Firebird' | Penstemon |
| » Penstemon 'Garnet' | Beard Tongue |
 | » Penstemon 'Grape Taffy' | Penstemon |
 | » Penstemon 'Jean Grace' | Beard Tongue |
| » Penstemon 'Papal Purple' | Penstemon |
| » Penstemon 'Pretty Petticoat' | Beard-tongue |
 | » Penstemon 'Rich Ruby' | Beard Tongue |
 | » Penstemon 'Ruby Candle' | Beard-tongue |
| » Penstemon 'Sour Grapes' | Beard-tongue |
 | » Penstemon 'Strawberry Taffy' | Penstemon |
 | » Penstemon albertinus | Beard Tongue |
 | » Penstemon digitalis 'Dark Towers' | Beard Tongue |
| » Penstemon digitalis 'Husker Red' | Beard Tongue | GPP |
 | » Penstemon glaber | Beard Tongue |
 | » Penstemon grandiflorus 'War Axe' | Beard Tongue |
 | » Penstemon heterophyllus 'Margarita BOP' | Foothill Penstemon |
| » Penstemon kunthii | Beard Tongue |
| » Penstemon x mexicali 'Red Rocks' | Beard Tongue |
| » Perovskia atriplicifolia | Russian Sage |
| » Perovskia atriplicifolia 'Longin' | Russian Sage |
| » Persicaria bistorta 'Superba' | Snakeweed |
| » Persicaria filiformis 'Painter's Palette' | European Bistort |
 | » Persicaria microcephala 'Red Dragon' | Snakeweed |
 | » Persicaria polymorpha | White Dragon | GPP |
| » Petasites japonicus var. giganteus 'Variegatus' | |
 | » Phaius flavus | Yellow Crane Orchid |
| » Philadelphus coronarius Aureus | Mock Orange |
 | » Phlomis russeliana | Jerusalem Sage | AGM,GPP |
 | » Phlomis tuberosa 'Amazone' | Jerusalem Sage |
| » Phlox 'Midnight Feelings' | Tall Garden Phlox |
| » Phlox 'Pleasant Feelings' | Tall Garden Phlox |
 | » Phlox divaricata 'London Grove Blue' | Wild Sweet William |
 | » Phlox divaricata 'Manita' | Wild Sweet William |
 | » Phlox paniculata 'David' | Tall Garden Phlox |
 | » Phlox paniculata 'Goldmine' | Tall Garden Phlox |
| » Phlox paniculata 'Laura' | Tall Garden Phlox |
| » Phlox paniculata 'Nora Leigh' | Tall Garden Phlox |
 | » Phlox paniculata 'Rubymine' | Tall Garden Phlox |
 | » Phlox paniculata 'Sherbet Cocktail' | Tall Garden Phlox |
 | » Phlox paniculata 'Tiara' | Tall Garden Phlox |
 | » Phlox stolonifera 'Home Fires' | Creeping Phlox |
| » Phormium 'Amazing Red' | |
| » Phormium 'Carousel' | |
| » Phormium 'Duskey Chief' | |
| » Phormium 'Maori (Rainbow) Queen' | |
| » Phormium 'Maori Sunrise' | |
| » Phormium 'Pink Panther' | |
| » Phormium 'Platt's Black' | |
| » Phormium 'Wings of Gold' | |
| » Phormium cookianum 'Tricolor' | |
 | » Phormium cultivars | New Zealand Flax |
| » Phormium tenax 'Atropurpurea' | New Zealand Flax |
| » Phormium tenax 'Bronze' | |
| » Phormium tenax 'Rubrum' | |
| » Phormium tenax 'Tom Thumb' | |
 | » Phygelius 'Coral Princess' (Croftway Series) | Cape Fuchsia |
 | » Phygelius 'Purple Prince' (Croftway Series) | Cape Fuchsia |
 | » Phygelius 'Snow Queen' (Croftway Series) | Cape Fuchsia |
 | » Phygelius 'Yellow Sovereign' (Croftway Series) | Cape Fuchsia |
 | » Phygelius x rectus 'Moonraker' | Yellow Cape Fuchsia |
 | » Phylliopsis hillieri 'Sugar Plum' | Phylliopsis |
| » Phyllostachys nigra | Black Bamboo |
 | » Physocarpus opulifolius 'Coppertina' | Ninebark |
| » Physocarpus opulifolius 'Dart's Gold' | Ninebark |
| » Physocarpus opulifolius 'Diablo' | Ninebark |
 | » Pinellia cordata | |
 | » Platanthera blephariglottis | White Fringed Orchid |
| » Platanthera clavelatta | Green Wood Orchid |
 | » Platanthera dilatata | Bog Candle |
 | » Platycodon grandiflorum 'Sentimental Blue' | Balloon Flower |
 | » Pleione pleionoides 'Blakeway Philips' | Hardy Terrestrial Orchid |
 | » Podophyllum 'Spotty Dotty' | Mayapple |
 | » Podophyllum delavayi | Mayapple |
| » Polemonium caeruleum 'Bressingham Purple' | Jacob's Ladder |
 | » Polemonium carneum 'Apricot Delight' | Jacob's Ladder |
 | » Polemonium reptans 'Stairway to Heaven' | Jacob's Ladder |
| » Polygonatum cirrhifolium | King Solomon's Seal |
| » Polygonatum commutatum | Solomon'sSeal | AGM |
| » Polygonatum commutatum 'Variegatum' | Solomon's Seal |
 | » Polygonatum lasianthum 'Kon Chiri Shima' | Solomon's Seal |
 | » Polygonatum odoratum 'Byakko' | Solomon's Seal |
 | » Polygonatum odoratum 'Koryu' | Solomon's Seal |
| » Polygonatum oppositifolium | Solomon's Seal |
| » Polygonatum punctatum | Solomon's Seal |
| » Polygonatum verticillatum | Whorled Solomon's Seal |
| » Polygonatum x hybridum 'Striatum' | Solomon's Seal |
| » Polystichum munitum | |
| » Polystichum polyblepharum | |
| » Polystichum setiferum 'Herrenhausen' | |
| » Potentilla 'Etna' | Cinquefoil |
| » Potentilla argyrophylla | Himalayan Cinquefoil |
| » Potentilla atrosanguinea 'Gibson's Scarlet' | Cinquefoil |
| » Potentilla megalantha | |
 | » Potentilla nepalensis 'Miss Willmott' | Cinquefoil |
| » Potentilla thurberii 'Monarch Velvet' | Cinquefoil |
| » Potentilla x Vera | Cinquefoil |
| » Primula 'Elizabeth Killelay'
| Primrose |
 | » Primula 'Francisca'/'Green Lace' | Primrose |
| » Primula 'Jay Jay' | Primrose |
 | » Primula japonica | Candelabra Primrose |
| » Primula Lilian Harvey | |
| » Primula florindae | Giant Cowslip |
 | » Primula juliae 'Wanda' | Primrose |
 | » Primula vialii | |
 | » Primula vulgaris | English Primrose |
| » Primula vulgaris 'April Rose' | Primrose |
 | » Primula vulgaris 'Dawn Ansell' | White Primrose |
 | » Primula vulgaris 'Miss Indigo' | Primrose |
| » Primula vulgaris 'Quaker's Bonnet' | Primrose |
| » Primula vulgaris 'Sapphire Blue' | Primrose |
 | » Primula vulgaris 'Sunshine Susie' | Primrose |
 | » Pteridophyllum racemosum | |
| » Pulmonaria 'Moonshine' | Lungwort |
| » Pulmonaria 'Raspberry Splash' | Lungwort |
| » Pulmonaria 'Silver Bouquet' | Lungwort |
| » Pulmonaria 'Trevi Fountain' | Lungwort |
 | » Pulsatilla vulgaris | |
| » Pulsatilla vulgaris Papagano | |
 | » Pycnanthemum muticum | Short-toothed Mountain Mint |
 | » Rabdosia longituba 'Momokaze' | Trumpet Spurflower |
| » Reineckea carnea | |
 | » Remusatia vivipara | Hitchhiker Elephant Ear |
 | » Restio festuciformis | Green Grass Reed |
 | » Rheum 'Ace of Hearts' | Ornamental Rhubarb |
 | » Rheum palmatum 'Tanguticum' | Ornamental Rhubarb |
 | » Rhododendron arboreum ssp. arboreum | Rhododendron |
| » Rhododendron auriculatum | Rhododendron |
 | » Rhododendron cinnabarinum ssp. xanthocodon | Rhododendron |
 | » Rhododendron fortunei | Rhododendron |
 | » Rhododendron macabeanum | Rhododendron |
 | » Rhododendron macrophyllum | Rhododendron |
 | » Rhododendron makinoi | Rhododendron |
 | » Rhododendron pachysanthum | Rhododendron |
 | » Rhododendron rex
ssp. fictolacteum | Rhododendron |
 | » Rhododendron strigillosum | Rhododendron |
 | » Ribes sanguineum 'Brocklebankii' | Red Flowering Currant |
| » Ribes sanguineum 'King Edward VI' | |
| » Rodgersia 'Firework' | Rodger's Flower |
 | » Rodgersia aesculifolia | Rodgersia |
 | » Rodgersia pinnata 'Chocolate Wing' | Rodger's Flower |
| » Rodgersia pinnata 'Elegans' | Rodgersia |
| » Rodgersia podophylla | |
| » Rodgersia podophylla 'Braunlaub' | Rodger's Flower |
| » Romneya coulteri | Matilija Poppy |
| » Rosa rugosa | |
 | » Rosa chinensis 'Mutabilis' | China Rose |
| » Rosa glauca | Redleaf Rose |
| » Roscoea 'Beesiana Alba' | Roscoea |
 | » Roscoea alpina | Roscoea |
| » Roscoea purpurea | Roscoea |
 | » Roscoea purpurea 'Cinnamon Stick' | Roscoea |
| » Rosmarinus officinalis 'Prostratus' | |
| » Rudbeckia 'Goldquelle' | |
| » Rudbeckia 'Green Wizard' | Cone Flower |
| » Rudbeckia 'Herbstonne' | |
 | » Rudbeckia fulgida 'Goldsturm' | Black-Eyed Susan |
 | » Rudbeckia subtomentosa 'Henry Eilers' | Sweet Coneflower |
 | » Ruscus aculeatus 'Christmas Berry' | Butcher's Broom |
 | » Ruta graveolens 'Curly Girl' | Rue |
| » Sagina subulata | Irish Moss |
| » Sagina subulata 'Aurea' | Scotch Moss |
| » Salix x 'Golden Curls' | |
| » Salix x 'Scarlet Curls' | |
| » Salvia 'Caradonna' | Sage |
 | » Salvia argentea | |
 | » Salvia greggii 'Wild Watermelon' | Autumn Sage |
| » Salvia lyrata 'Purple Knockout' | Sage |
 | » Salvia microphylla 'Hot Lips' | Baby Sage |
| » Salvia nemerosa 'East Friesland' | Salvia |
 | » Salvia nemorosa 'Marcus' | Sage |
| » Salvia officinalis 'Berggarten' | Sage |
 | » Salvia officinalis 'Purpurea' | |
 | » Salvia patens | |
| » Salvia verticillata | Sage |
 | » Sambucus nigra 'Black Beauty' | |
 | » Sambucus nigra 'Black Lace' | Elderberry |
 | » Sambucus racemosa 'Golden Locks' | Elderberry |
| » Sanguinaria canadensis | Bloodroot |
| » Sanguisorba menziesii 'Dali Marble' | Burnet |
| » Sanguisorba minor | Salad Birnet |
| » Sanguisorba obtusa | |
| » Sanicula caerulescens | Blue Sanicle |
| » Santolina pinnata 'Bowles Form' | Cotton Lavender |
 | » Saponaria ocymoides | |
| » Saponaria officinalis | Bouncing Bet |
| » Sarcococca humilis | |
| » Sarracenia 'Dana's Delight' | Pitcher Plant |
 | » Sarracenia 'Doodle Bug' | Pitcher Plant |
 | » Sarracenia 'Judith Hindle' | Pitcher Plant |
 | » Sarracenia 'Lady Bug' | Pitcher Plant |
 | » Sarracenia 'Love Bug' | Pitcher Plant |
 | » Sarracenia 'Red Bug' | Pitcher Plant |
 | » Sarracenia x catesbaei | Pitcher Plant |
| » Saruma henryi | |
| » Sauromatum venosum | |
| » Saxifraga cortusifolia | Saxifrage |
| » Saxifraga fortunei | |
 | » Saxifraga stolonifera | Srawberry Geranium |
| » Saxifraga x urbium | London Pride |
 | » Scabiosa alpina | |
| » Scabiosa caucasica | Pincushion Flowers |
| » Scabiosa columbaria 'Butterfly Blue' | Pincushion Flower |
| » Scabiosa columbaria 'Pink Mist' | Pincushion Flower |
| » Scabiosa columbaria 'Vivid Violet' | Pincushion Flower |
| » Scabiosa vestita | Pincushion Flower |
 | » Scadoxus (Haemanthus) multiflorus | Blood Flower | AGM |
| » Schefflera taiwaniana | Umbrella Tree |
| » Schizophragma hydrangeoides | Hydrangea Vine |
| » Schizophragma hydrangeoides 'Moonlight' | Hydrangea Vine |
| » Schizophragma hydrangeoides Rosea | Hydrangea Vine |
 | » Schizostylis coccinea | Crimson Flag |
| » Schizostylis coccinea 'Oregon Sunset' | Crimson Flag |
 | » Schizostylis coccinea 'Rosea' | Kaffir Lily |
| » Schizostylis coccinea var. alba | Kaffir Lily |
 | » Sedum 'Abbey Dore' | Stonecrop |
 | » Sedum 'African Sunset' | Stonecrop |
 | » Sedum 'Autumn Fire' | Stonecrop |
 | » Sedum 'Autumn Joy' | Stonecrop | AGM |
 | » Sedum 'Black Jack' | Stonecrop |
| » Sedum 'Blade Runner' | Stonecrop |
| » Sedum 'Chocolate Drop' | Stonecrop |
 | » Sedum 'Class Act' | Stonecrop | AGM |
 | » Sedum 'Cloud Walker' | Stonecrop |
 | » Sedum 'Crazy Ruffles' | Stonecrop |
 | » Sedum 'Crystal Pink' | Stonecrop | AGM |
| » Sedum 'Lajos/Autumn Charm' | Stonecrop |
 | » Sedum 'Maestro' | Stonecrop |
| » Sedum 'Mr Good Bud' | Stonecrop | AGM |
| » Sedum 'Picolette' | Stonecrop |
 | » Sedum 'Postman's Pride' | Stonecrop |
 | » Sedum 'Purple Emperor' | Stonecrop | AGM |
| » Sedum 'Sunkissed' | Stonecrop |
| » Sedum 'T-Rex' | Stonecrop |
 | » Sedum 'Vera Jameson' | Stonecrop | AGM |
| » Sedum 'Xenox' | Stonecrop | AGM |
 | » Sedum erythrostictum 'Frosty Morn' | |
| » Sedum erythrostictum 'Mediovariegatum' | |
| » Sedum kamtschaticum | Russian Stonecrop |
| » Sedum kamtschaticum Variegatum | Russian Stonecrop |
 | » Sedum palmeri DJH 420B | Sedum |
 | » Sedum rupestre 'Angelina' | Stonecrop |
 | » Sedum rupestre 'Blue Spruce' | Stonecrop |
| » Sedum spathulifolium 'Cape Blanco' | Stonecrop | AGM |
| » Sedum telephium 'Bon Bon' | Stonecrop |
| » Sedum telephium 'Gooseberry Fool' | Stonecrop |
 | » Sedum telephium 'Matrona' | Stonecrop | AGM |
 | » Sedum telephium 'Red Cauli' | Stonecrop | AGM |
| » Sempervivum Various Cultivars | Hens and Chicks |
 | » Senecio (Brachyglottis) greyi 'Sunshine' | Senecio | AGM,GPP |
| » Setcreasea pallida 'Purple Heart' | |
| » Silene asterias | Campion |
 | » Silene virginica | Virginia Catchfly |
| » Sisyrinchium 'Devon Skies' | Blue-Eyed Grass |
| » Sisyrinchium californicum | Golden eyed Grass |
 | » Sisyrinchium striatum | Yellow-eyed Grass | AGM,GPP |
 | » Smilacina oleracea | False Solomon's Seal |
 | » Solanum crispum 'Glasnevin' | Chilean Potato Vine |
| » Solanum pyracanthum | Firethorn Nightshade |
| » Soleirolia soleirolii | Baby's Tears |
| » Soleirolia soleirolii 'Aurea' | Baby's Tears |
| » Soleirolia soleirolii 'Variegata' | Baby's Tears |
 | » Solidago caesia | Bluestem Goldenrod |
| » Solidago praecox | Golden Rod |
 | » Sorbaria sorbifolia 'Sem' | False Spiraea |
 | » Spigelia marilandica | Indian Pink |
 | » Spiranthes cernua var. odorata 'Chadd's Ford' | Lady's Tresses |
| » Stachys albomentosa 'Hidalgo' | Salmon Betony |
 | » Stachys byzantina | Lamb's-Ears |
| » Stipa gigantea | |
 | » Stipa tenuissima | Mexican Feather Grass |
| » Streptopus simplex | Twistedstalk |
| » Syneilesis aconitifolia | |
| » Syneilesis palmata Kikko | Umbrella Plant |
| » Tacca chantrieri 'Green Isle' | Black Bat Flower |
 | » Tacca chantrieri f. macrantha | Black Bat Flower |
| » Tacca integrifolia 'Select' | White Bat Plant |
| » Tellima grandiflora | Fringecup |
| » Teucrium hyrcanicum 'Purple Tails' | Caucasian Germander |
| » Thalictrum 'Black Stockings' | Meadow Rue |
 | » Thalictrum aquilegifolium | Meadow Rue |
| » Thalictrum aquilegifolium 'Thundercloud' | Meadow Rue | AGM |
 | » Thalictrum delavayi 'Hewitts Double' | Meadow Rue | AGM |
| » Thalictrum flavum ssp. glaucum | Meadow Rue | AGM |
| » Thalictrum ichangense Evening Star Strain | Meadow Rue |
| » Thalictrum rochebrunianum | Meadow Rue |
 | » Thamnocortus insignis | Thatching Reed |
| » Thermopsis villosa | Carolina Lupin |
| » Thymus praecox Alba | |
| » Thymus praecox Purple Carpet | Creeping Thyme |
| » Thymus pseudolanguinosus | Woolly Thyme |
| » Tiarella 'Cascade Creeper' | Foamflower |
| » Tiarella 'Happy Trails' | Foamflower |
| » Tiarella 'Running Tapestry' | Foamflower |
| » Tibouchina urvilleana | |
 | » Trachycarpus fortunei | Windmill Palm |
 | » Tradescantia 'Sunshine Charm' | Spiderwort |
 | » Tradescantia 'Sweet Kate'/'Blue and Gold' | Spiderwort |
 | » Tricyrtis 'Amanogawa' | Toad Lily |
 | » Tricyrtis 'Gilt Edge' | Toad Lily |
 | » Tricyrtis 'Gilty Pleasure' | Toad Lily |
 | » Tricyrtis 'Kohaku' | Toad Lily |
 | » Tricyrtis 'Mine-no-Yuki' | Toad Lily |
 | » Tricyrtis 'Raspberry Mousse' | Toad Lily |
| » Tricyrtis 'Shining Light' | Toad Lily |
 | » Tricyrtis 'Taipei Silk' | Toad Lily |
 | » Tricyrtis Blue Haven Hybrid | Toad Lily |
 | » Tricyrtis flava | Toad Lily |
 | » Tricyrtis formosana | Toad Lily |
 | » Tricyrtis formosana 'Autumn Glow' | Toad Lily |
 | » Tricyrtis formosana 'Dark Beauty' | Toad Lily |
 | » Tricyrtis formosana 'Empress' | Toad Lily |
 | » Tricyrtis hirta | Toad Lily |
| » Tricyrtis hirta 'Miyazaki Hybrids' | Toad Lily |
 | » Tricyrtis hirta 'Shirohotogisu' | Toad Lily |
 | » Tricyrtis hirta 'Tojen' | Toad Lily |
 | » Tricyrtis hirta var. masamunei 'Minazuki' | Toad Lily |
| » Tricyrtis latifolia | Toad Lily |
 | » Tricyrtis latifolia 'Golden Leopard' | Toad Lily |
 | » Tricyrtis macrantha ssp. macranthopsis | Weeping Golden Toad Lily |
 | » Tricyrtis nana 'Karasuba' | Toad Lily |
 | » Tricyrtis ohsumiensis | Yellow Toad Lily |
 | » Tricyrtis perfoliata | Toad Lily |
| » Tricyrtis x sinonome | Toad Lily |
| » Trifolium repens 'Dragon's Blood' | Clover |
| » Trillium catesbaei
| Bashful Wakerobin |
 | » Trillium erectum | Red Trillium |
| » Trillium grandiflorum | Snow Trillium |
 | » Trillium grandiflorum 'Plenum' | Snow Trillium | AGM |
 | » Trillium luteum | Yellow Trillium |
| » Trillium recurvatum | Prairie Trillium |
 | » Trillium sessile | Toadshade Trillium |
| » Vaccinium 'Pink Lemonade' | Pink Blueberry |
| » Vaccinium ovatum | Huckelberry |
 | » Verbena bonariensis | Brazilian Verbena |
 | » Verbena hastata | Blue Vervain |
 | » Veronica austriacia ssp. teucrium 'Crater Lake Blue' | Speedwell |
 | » Veronica gentianoides | Gentian Speedwell |
| » Veronica gentianoides 'Ramona' | Gentian Speedwell | AGM |
| » Veronica peduncularis 'Georgia Blue' | Speedwell |
| » Veronica spicata 'Foxy Lady' | Speedwell |
| » Veronicastrum sibiricum | Culver's Root |
| » Veronicastrum virginicum 'Roseum' | Pink Culver's Root |
| » Viburnum bodnantense 'Dawn' | |
| » Viburnum farreri Nanum | Vibirnum |
 | » Viburnum foetidum var. quadrangularis | Viburnum |
| » Viburnum nudum | Smooth Withrod-2gal |
| » Viburnum plicatum f. tomentosum 'Mariesii' | |
 | » Viburnum pragense | Viburnum - |
| » Viburnum prunifolium | Black Haw- |
| » Viburnum x burkwoodii | Viburnum |
| » Vinca minor | Periwinkle |
| » Vinca minor 'Alba' | |
| » Vinca minor 'Illumination' | Periwinkle |
 | » Viola 'Mars' | Violet |
 | » Viola 'Silver Samurai | Violet |
 | » Viola labradorica 'Purpurea' | Labrador Violet |
| » Viola sororia 'Freckles' | Violet |
| » Wachendorfia thyrsiflora | Bloodroot |
 | » Waldsteinia geoides | Barren Strawberry |
 | » Wollemia nobilis | Wollemi Pine |
 | » x Mangave (Manfreda) 'Macho Mocha' | Deciduous Agave |
 | » Yucca aloifolia 'Marginata' | Spanish Bayonet |
| » Yucca glauca 'Pendula' | |
 | » Yucca gloriosa 'Variegata' | Spanish Dagger |
 | » Yucca linearifolia | Spanish Dagger |
 | » Yucca recurvifolia 'Variegata' | Soft Leaf Yucca |
 | » Yucca rostrata 'Sapphire Skies' | Adam's Needle |
 | » Zantedeschia 'Edge of Night' | Calla Lily |
 | » Zantedeschia aethiopica 'Crowborough' | Calla Lily | AGM |
 | » Zantedeschia aethiopica 'Green Goddess' | Calla Lily | AGM |
 | » Zantedeschia aethiopica 'Marshmallow' | Calla Lily |
 | » Zantedeschia aethiopica 'White Giant' | Calla Lily |
| » Zauschneria garetti 'Orange Carpet' | California Fuchsia |
| » Zingiber mioga 'Dancing Crane' | Myoga Shade Ginger |
 | » Zingiber mioga 'Silver Arrow' | Myoga Shade Ginger |
 | » Zingiber mioga 'White Feather' | Myoga Shade Ginger |
