| » 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 vitifolium 'Veronica Tennant' | Flowering Maple | AGM |
| » Acacia baileyana | Cootamundra Wattle | AGM |
 | » Acacia baileyana 'Purpurea' | Cootamundra Wattle | AGM |
 | » 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 |
| » 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 'Brunette' | Bugbane | AGM,GPP |
| » 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 |
 | » Adonis amurensis | Adonis |
 | » Aeonium arboreum 'Zwartkop' | Aeonium | AGM |
 | » Agapanthus 'Back in Black' | 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 |
| » Agave (Azul) | Maguey Azul |
 | » Agave americana | Century Plant | AGM |
| » Agave americana 'Marginata' | Century Plant | AGM |
 | » Agave americana 'Mediopicta Alba' | Century Plant | AGM |
 | » Agave parryi | Parry's Agave |
 | » Ainsliaea cordifolia | Ainsliaea |
| » Ajuga reptans 'Black Scallop' | Bugleweed |
| » Ajuga reptans 'Burgundy Glow' | Bugleweed |
 | » Ajuga reptans 'Catlin's Giant' | Bugleweed | AGM |
| » Ajuga reptans 'Golden Glow' | Bugleweed |
| » Ajuga x tenorii 'Chocolate Chip' | Bugleweed |
| » Akebia quinata | Chocolate Vine |
 | » Albizia julibrissin | Silk Tree | AGM |
| » Alchemilla alpina | Lady's Mantle |
| » Alchemilla ellenbeckii | Lady's Mantle | AGM |
| » Alchemilla erythropoda | Lady's Mantle | AGM |
 | » Alchemilla lithophila | Lady's Mantle |
 | » 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 |
| » Alstroemeria 'Glory of the Andes' | 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' | Windflower |
 | » Anemone hupehensis var. japonica 'Pamina' | Windflower | AGM |
| » Anemone hupehensis var. japonica 'Queen Charlotte' | Windflower |
 | » Anemone keiskeiana | Windflower |
 | » 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 |
| » Anthemis tinctoria 'Kelwayii' | Golden Marguerite |
| » Anthemis tinctoria 'Sauce Hollandaise' | Golden Marguerite |
 | » Anthriscus sylvestris 'Ravenswing' | Cow Parsley |
 | » Antirrhinum braun-blanquetti | Perennial Snapdragon |
 | » Aquilegia 'Lime Frost' | Columbine |
| » Aquilegia 'McKana Giants' | Columbine |
 | » Aquilegia 'Woodside Gold' | Columbine |
| » Aquilegia chrysantha 'Denver Gold' | Golden 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 consanguineum Dark Form | Himalayan Cobra Lily |
 | » Arisaema costatum | 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 jacquemontii | Cobra Lily |
 | » Arisaema kishidae Patterned Selection | Cobra Lily |
 | » Arisaema nepenthoides | Cobra Lily |
 | » Arisaema sikokianum | Cobra Lily |
 | » Arisaema speciosum | Cobra Lily |
 | » Arisaema speciosum var. magnificum | Cobra Lily |
| » Arisaema speciosum var. mirabile | 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 divaricatus | White Wood Aster | GPP |
 | » Aster divaricatus 'Eastern Star' | White Wood Aster | 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 chinensis 'Raspberry Pink' | False Spiraea |
| » Astilbe chinensis 'Vision in Red' | False Spiraea |
| » Astilbe chinensis 'Visions' | False Spiraea |
| » Astilbe japonica 'Montgomery' | 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 | 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 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 australis | Blue False Indigo | AGM |
| » Baptisia lactea (leucantha) | False Indigo |
 | » Begonia grandis ssp. evansiana | Hardy Begonia | AGM |
| » Begonia josephii 'Selecta' | Hardy Begonia | AGM |
| » Begonia rubella 'Pink Princess' | Hardy Begonia | AGM |
| » Bergenia 'Bressingham White' | Heartleaf Bergenia | AGM |
 | » Bergenia cordifolia | Heartleaf Bergenia | GPP |
| » Bergenia cordifolia 'Bressingham Ruby' | Heartleaf Bergenia |
 | » Bergenia cordifolia 'Tubby Andrews' | Pig Squeak |
 | » Betula x 'Royal Frost' | Purple Birch |
| » Billardiera longiflora | Appleberry | AGM |
 | » Blechnum spicant | Deer Fern | AGM,GPP |
| » Bletilla striata | Chinese Ground Orchid |
 | » Brunnera macrophylla | Siberian Bugloss | AGM |
 | » Brunnera macrophylla 'Hadspen Cream' | Siberian Bugloss | AGM |
 | » Brunnera macrophylla 'Jack Frost' | Siberian Bugloss | GPP |
| » Brunnera macrophylla 'Langtrees' | Siberian Bugloss |
 | » Brunnera macrophylla 'Looking Glass' | Heartleaf Alkanet |
| » Brunnera macrophylla 'Silver Wings' | Siberian Bugloss |
| » Buddleia davidii 'Royal Red' | Butterfly Bush |
| » Buddleja alternifolia 'Argentea' | Beauty Bush | AGM |
 | » Buddleja davidii 'Black Knight' | Butterfly Bush | AGM |
 | » Buddleja davidii 'Dartmoor' | Butterfly Bush | AGM |
| » Buddleja davidii 'Purple Prince' | Butterfly Bush |
| » Buddleja fallowiana var. alba | Butterfly Bush | AGM |
| » Buddleja globosa | Orange Ball Tree | AGM |
 | » Buddleja lindleyana | Lindley's Butterfly Bush |
 | » Buddleja x weyeriana 'Honeycomb' | Butterfly Bush |
| » Buphthalmum salicifolium | Yellow Ox-Eye Daisy |
 | » Cacalia delphinifolia | Cacalia |
| » Calamagrostis x acutiflora 'Karl Foerster' | Feather Reed Grass |
| » Calamagrostis x acutiflora 'Overdam' | Feather Reed Grass |
 | » Calanthe discolor | Hardy Calanthe Orchid |
 | » Calanthe Kozu Hybrids (Red) | 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 |
| » Camassia cusickii | Cusick's Camas |
 | » Camassia leichtlinii | Great Camas | AGM |
 | » Camassia quamash | Camas Lily | GPP |
 | » Campanula 'Purple Sensation' | Bellflower |
 | » Campanula 'Sarastro' | Bellflower |
 | » Campanula cochleariifolia 'Elizabeth Oliver' | Fairies Thimbles |
| » Campanula glomerata 'Emerald' | Clustered Bellflower |
| » Campanula lactiflora 'Loddon Anna' | Milky Bellflower | AGM |
| » 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 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 |
 | » Caryopteris divaricata 'Snow Fairy' | 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 |
 | » Centranthus ruber | Valerian |
| » Centranthus ruber 'Alba' | Valerian |
| » Cephalaria gigantea | Giant Scabious |
| » Ceratostigma griffithii | Burmese Plumbago |
 | » Ceratostigma willmotianum | Chinese Plumbago | AGM |
| » Chamaerops humilis | Mediterranean Fan Palm | AGM |
 | » Chelone lyonii | Pink Turtlehead |
 | » Chelone obliqua | Rose Turtlehead |
| » 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 (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) 'Kullus' | Clematis |
 | » Clematis (Kivistik Collection) 'Marmori' | Clematis |
 | » Clematis (Kivistik Collection) 'Minister' | Clematis |
 | » Clematis (Kivistik Collection) 'Piilu' | Clematis |
| » Clematis (Kivistik Collection) 'Rahvarinne' | Clematis |
| » Clematis (Kivistik Collection) 'Sakala' | Clematis |
 | » Clematis (Kivistik Collection) 'Silmakivi' | Clematis |
| » Clematis armandii | Evergreen Clematis |
| » Clematis armandii 'Apple Blossom' | Evergreen Clematis | AGM |
 | » Clematis heracleifolia 'China Purple' | Clematis |
| » Clematis montana 'Grandiflora' | Anemone Clematis | AGM |
| » Clematis montana 'Rubens' | Anemone Clematis |
 | » Clematis recta 'Purpurea' | Purple-Leaved Clematis |
 | » Clematis texensis 'Gravetye Beauty' | Clematis |
| » Clematis texensis 'Princess Diana' | Clematis | AGM |
 | » Clematis Various Cultivars | Clematis |
 | » Clematis x jouiniana 'Mrs Robert Brydon' | Clematis |
 | » Clerodendron bungei 'Pink Diamond' | Rose Glory Bower |
 | » Clethra barbinervis 'Takeda Nishiki' | Japanese Clethra |
 | » Clivia miniata | Fire Lily | AGM |
 | » Codonopsis lanceolata | Bonnet Bellflower |
 | » Colocasia esculenta 'Black Magic' | Taro |
| » Colocasia esculenta 'Illustris' | Taro |
| » Convallaria majalis | Lily-of-the-Valley | AGM |
| » Convallaria majalis 'Rosea' | Lily-of-the-Valley |
 | » Coreopsis 'Tequila Sunrise' | Tickseed |
| » Coreopsis auriculata 'Zamfir' | Tickseed |
| » Coreopsis verticillata 'American Dream' | Thread-Leaved Tickseed |
| » Coreopsis verticillata 'Moonbeam' | Thread-Leaved Tickseed | AGM |
| » 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 flexuosa 'China Blue' | Corydalis |
 | » Corydalis quantmeyerana 'Chocolate Star' | Corydalis |
| » 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 x crocomiiflora 'Lucifer' | Montebretia | AGM,GPP |
| » Cyclamen coum | Persian Violet | AGM,GPP |
 | » Cyclamen hederifolium | Ivyleaf Cyclamen | AGM,GPP |
 | » Cynara cardunculus | Cardoon | AGM |
 | » Cypripedium formosanum | Formosa Lady's Slipper |
 | » Cypripedium japonicum | Japanese Lady's Slipper |
 | » Cypripedium parviflorum (calceolus) 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 |
| » 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 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 transatlantica 'Eternal Fragrance' | Daphne |
 | » Daphne x transatlantica 'Summer Ice' | Daphne | GPP |
| » Darmera peltata | Umbrella Plant | AGM |
| » Delosperma floribundum 'Starburst' | Ice Plant |
 | » Delphinium 'Delft Blue' | Larkspur |
 | » Delphinium 'Red Caroline' | Larkspur |
| » Delphinium New Millenium Series | Delphinium |
| » Delphinium nudicaule 'Laurin' | Larkspur |
| » Deschampsia caespitosa 'Northern Lights' | Tufted Hair Grass |
| » Dianthus 'First Love' | Pinks |
| » Dianthus barbatus var. nigrescens 'Sooty' | Sweet William |
| » Dianthus grataniopolitanus 'Bath's Pink' | Cheddar Pink |
 | » Dianthus gratianopolitanus 'Firewitch' | Cheddar Pink |
 | » Dianthus gratianopolitanus 'Wicked Witch' | Cheddar Pink |
 | » Dianthus plumarius 'Fragrant White' | Cottage Pink |
| » Dicentra 'Bacchanal' | Bleeding Heart | AGM |
| » 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 |
 | » Dicksonia antarctica | Tasmanian Tree Fern | AGM |
| » Dierama pulcherrimum | Angel's Fishing Rod |
 | » Disporum cantoniense Purple Flower Form | Fairy Bells |
 | » Disporum sessile 'Cricket' | Fairy Bells |
 | » Disporum sessile 'Variegata' | 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 runyonii 'Topsy Turvy' | Mexican Hen and Chicks | AGM |
 | » Echeveria Various Cultivars | Mexican Hen & Chicks |
 | » Echinacea 'Mango Meadowbrite' | Coneflower |
 | » Echinacea 'Orange Meadowbrite' | Coneflower |
 | » Echinacea 'Pixie Meadowbrite' | 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 paradoxa | Yellow Coneflower |
| » Echinacea purpurea 'Alaska' | White Swan Coneflower |
| » Echinacea purpurea 'Double Decker' / 'Doppleganger' | Purple Coneflower |
 | » Echinacea purpurea 'Fancy Frills' | Coneflower |
| » Echinacea purpurea 'Fatal Attraction' | Purple Coneflower |
 | » Echinacea purpurea 'Green Envy' | 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 'Pica Bella' | Coneflower |
 | » Echinacea purpurea 'Razzmatazz' | 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 |
 | » 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 |
| » 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 '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 variifolium | Moroccan Sea Holly |
 | » Eryngium yuccifolium | Rattlesnake Master |
 | » Erysimum 'Bowles Mauve' | Wallflower | AGM |
 | » Erysimum 'Bowles Variegated' | |
 | » Erysimum 'Fragrant Sunshine' | Wallflower | AGM |
| » Erythronium 'Pagoda' | Trout Lily | GPP |
| » Erythronium californicum 'White Beauty' | California Fawn Lily | GPP |
| » Eucalyptus species | Eucalyptus |
| » 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 amygdaloides var. robbiae | Mrs Rob's Bonnet | AGM |
| » Euphorbia Blackbird / 'Nothowlee' | Spurge |
| » Euphorbia characias 'Portuguese Velvet' | Evergreen Spurge | AGM |
 | » Euphorbia characias 'Tasmanian Tiger' | Evergreen Spurge |
 | » Euphorbia characias ssp. wulfenii | Evergreen Spurge | AGM,GPP |
| » Euphorbia Excalibur / 'Froeup' | Spurge | AGM |
| » Euphorbia griffithii 'Dixter' | Spurge | AGM |
 | » Euphorbia griffithii 'Fireglow' | Spurge |
 | » Euphorbia myrsinites | Donkey Tail Spurge | AGM |
 | » Euphorbia polychroma 'Bonfire' | Cushion Spurge |
| » Euphorbia polychroma 'First Blush' | Cushion Spurge |
 | » Euphorbia x martinii 'Rudolph' | Cushion Spurge |
 | » Fallopia japonica 'Variegata' | Japanese Fleece Flower |
 | » Fatshedera lizei 'Lemon & Lime' / 'Annemieke' | Tree Ivy | AGM |
| » Fatsia japonica | 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 |
| » 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 |
 | » Gaillardia aristata 'Arizona Sun' | Blanket Flower |
 | » Gaillardia x grandiflora 'Fanfare' | Blanket Flower |
 | » Gaillardia x grandiflora 'Oranges and Lemons' | Blanket Flower |
 | » Galium odoratum | Sweet Woodruff |
 | » Gardenia jasminoides 'Kleim's Hardy' | 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 |
| » 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 'Brookside' | Cranesbill | AGM,GPP |
| » Geranium 'Crystal Lake' | Cranesbill |
 | » Geranium 'Jolly Bee' | Cranesbill | AGM |
| » Geranium 'Patricia' | Cranesbill | AGM,GPP |
| » Geranium 'Pink Penny' | Cranesbill |
 | » Geranium 'Rozanne' | Cranesbill | AGM,GPP |
| » Geranium 'Stephanie' | Cranesbill |
 | » Geranium 'Sweet Heidy' | 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 'Samobor' | Mourning Widow |
| » Geranium phaeum 'Springtime' | Mourning Widow |
 | » Geranium pratense 'Summer Skies' | Cranesbill |
 | » Geranium psilostemon | Cranesbill | AGM |
 | » Geranium renardii | Cranesbill | AGM |
| » Geranium sanguineum 'Album' | Cranesbill | AGM |
| » 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 coccineum 'Borisii' | Avens |
| » Geum rivale 'Album' | Water Avens |
 | » Geum rivale 'Leonard's Variety' | Water Avens |
 | » Gillenia trifoliata | Bowman's Root | AGM,GPP |
 | » Gladiolus papilio | Butterfly Gladiolus |
 | » Globba schomburgkii | Golden 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 |
| » Hebe 'Autumn Glory' | Hebe |
| » Hebe 'Blue Gem' | Hebe |
| » Hebe 'Mrs Winder' | Hebe | AGM |
| » Hebe 'Oratia Beauty' | Hebe | AGM |
| » Hebe 'Shiraz' | 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 |
| » Hebe Various Cultivars | Hebe |
| » Hedychium 'Gold Spot' | Hardy Ginger |
 | » Hedychium (Pink) | Hardy Ginger |
| » Hedychium coccineum 'Sonya' | Hardy Ginger |
 | » Hedychium coccineum 'Tara' | Hardy Ginger | AGM |
 | » Hedychium coronarium | Butterfly 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 spicatum | Hardy Ginger |
 | » Hedychium thyrsiforme | Hardy Pincushion Ginger |
| » Helenium 'Moerheim Beauty' | Sneezeweed | AGM,GPP |
| » 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 'Ivory Prince' | Lenten Rose |
 | » 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 croaticus | Lenten Rose |
 | » Helleborus dumetorum | Lenten Rose |
| » Helleborus foetidus | Stinking Hellebore | AGM,GPP |
 | » Helleborus foetidus Red Silver Strain | Stinking Hellebore | AGM,GPP |
 | » Helleborus foetidus Wester Flisk Strain | Hellebore | AGM,GPP |
 | » Helleborus lividus 'Elegance' | Lenten Rose | AGM |
 | » Helleborus multifidus | Lenten Rose |
| » Helleborus odorus | Lenten Rose |
 | » Helleborus purpurascens | Lenten Rose |
 | » Helleborus torquatus |
