Escobaria vivipara var. arizonica Williams, AZ 6500ft
Escobaria vivipara var. arizonica or many-headed Spiny-star cactus are clumping plants that really live up to their name vivipara. The plants can get tennis ball sized and can offset tremendously. This species is one of the most cold hardy species of cactus. Plants have taken -22F in our garden and grow easily in most habitat zones within the area. In general this species grows from Canada to Mexico and from Wisconson to Arizona.
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. Try to plant outdoor 90 days before 1st hard freeze.
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