Hardy Palm and Subtropical Board
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Re: Trichocereus hardy where others melt
My Rostrata is a little older than yours. It took a very long time to form a trunk. Right now, it's got about 3 or 4 inches of clear trunk from the soil line. That's all. Grows VERY slowly. I provide no winter protection for it whatsoever. I believe the combination of wet, heavy clay and long, damp winters combine to keep this Yucca barely going.
Just across the Delaware River, in New Jersey, the soil becomes fast draining and more sandy. And you begin to see Rostratas here and there. They definitely don't like clay.
Jim, Wilmington, DE, 7a
Last 30 Years Avg. Winter Low: 7.50F
Last 20 Years Avg. Winter Low: 8.35F
Last 10 Years Avg. Winter Low: 8.40F
Favorite Palms: Species: Phoenix Canariensis / Genus: Sabal