Hardy Palm and Subtropical Board
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Re: Moving up a half zone!
Jumping from 7a to 7b is a botanically significant leap. As is 7b to 8a. After that, the wow factor diminishes with every half zone increment.
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