Agave utahensis ssp. kaibabensis Grand Canyon Form 6000ft

Agave utahensis ssp. kaibabensis is commonly called the Grand Canyon Century Plant. These have proven to be hardy in Colorado taking -22F on a few occasions. This particular form has been growing in our garden for 20+ years and bloomed several times with a large 12ft flower spike. Blooming plants have reached 20" acros and 12" tall, occasionaly clumping but this tends to be more solitary. Probably the most cold hardy century plant. 
 
The seed for this plant was collected near Bitter Springs, AZ at 6000ft in elevation. The plants were mostly solitary and growing in sandstone soil, other locatoins have been growing in limestone and marble. Seems to be no preference. Plants like afternoon filtered light.
 
I do not guarantee these in a zone 5/6/7 because everyones growing conditions are different but this would be a good trial plant to grow in your cold outdoor garden. Extreme drainage is required for this species. Try to plant outdoor 90 days before 1st hard freeze. 
 
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