Agave mckelveyana
Agave mckelveyana is an extremely cold hardy century plant to zone 6.

Agave mckelveyana is endemic to moderate to high elevations in Arizona and is an extremely cold hardy century plant to zone 6. Its grey-green leaves can be up 12-16 inches long with reddish to black tips and lateral spines. It is solitary or can make occasional pups. Though quite hardy, it is sensitive to overwatering so it must be bone dry through the winter, especially if grown outdoors. In colder zones or to be safe protect indoors in winter.
Common Name: McKelvey's Century Plant
Family: Asparagaceae (The Asparagus Family)
Zone Hardiness: 6-9
Light: Full Sun, Part Sun
Height: 12-24"
Width: 12-24"
Primary Bloom Colour: Yellow
Secondary Bloom Colour:
Bloom Time: Summer
Foliage Colour: Bluish
Class: Evergreen
Type: Perennial
Soil Moisture: Dry, Drought Tolerant
Stem Colour:
Fragrance: No
Berries:
Benefits: Hummingbirds
Deer Resistant: Yes
BC Native: No
Native Habitat: Endemic to west-central Arizona at elevations from 800-2200 metres.
Award:
Geographical Origin: North America