Yucca angustissima ssp. toftiae

Yucca toftiae or Glen Canyon Yucca.  This yucca can get the tallest flower spike of all the yucca. In a good year it can reach 15ft tall, not so wet it will only get a few feet tall.  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.
 
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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