Hardy Palm and Subtropical Board
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Re: Cincinnati Zoo Pictures
According to the latest USDA Hardiness Zones Map, Cincy is borderline 6a/6b. I say that just to give folks a reference point when considering the plants at the zoo.
Some of the magnolias had heavy brown tomentum on the undersides of leaves. These often indicate hardier cultivars. However, a lot of the pictured magnolias looked like straight species with no tomentum and irregular form. I would think those magnolias (straight species) would get lit up with a true low 7a, 6b, or 6a winter.
Outside of the Crapes (which surprised me like the "wild" magnolias), the other stuff should be fine -- even in 6a winters: Baldcypress, Bamboo, Hibiscus.
The palm you call a Palmetto... Strikes me as something other than Sabal Palometto. The trunk seems hairy, and the petioles longer and thinner than what we would see in a typical palmetto. However, the fronds themselves look right. Costa-palmate -- and I don't know very many palms other than S. Palmetto with leaves like that. So maybe it's just a little atypical.
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