Yucca harrimaniae Gunnison co, CO

Yucca harrimaniae or Harriman's Yucca. Seed was collected near Gunnison, Colorado. Rosettes have stayed between 5 and 8" in diameter.  Plants have taken -22F in our garden and are subject for trial in your garden. In the wild plants have taken -30s and rarely get above freezing in winter. Has to be one of the most cold tolerant Yucca species.
 
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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