Have wetter than normal winters ever caused any fatality or injury to these Cliffroses?
One reason I am inquiring is that, in Cheyenne WY, which is climatically very similar to the Flagstaff AZ area both for temperature and precipitation, out of the many cliffroses planted there, none have exceeded 3-4′ in height, while in Denver CO they are routinely 6-8′, and in Albuquerque NM they are routinely 10’+. It seems that either mildness of winter and/or increasing summer warmth is responsible for larger size performance. Your attention to this inquiry will help me in my research for a new ratings system for hardiness and size performance of trees and shrubs. Arboretum reply: Here at the Arboretum we have worked extensively with the rare species of Cliffrose, Purshia subintegra, that grows in the desert areas of the Verde Valley (2500-3500′). I don’t have much experience with Purshia stansburiana in the wild, but from meandering in the forest, I have seen P stansburiana commonly growing 5′-7′ tall. We have also grown them in our greenhouse, but they generally don’t get much ta
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