Hardy Palm and Subtropical Board
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Fast to trunk but slower to replace a crown of leaves than Butia
Posted by Ryan Monroe LA on 4/5/2017, 5:37 pm, in reply to "Anyone have success with Mules in 7b/8a?"
I've got one that has to be pushing 20' now and it has gone through 12F, 14F, and 15F unprotected with maybe 50% foliar damage each time. It trunks quickly, but that is just because it puts out alot of trunk growth for every frond that emerges. Mule palms are actually not particularly fast (here) to replace a crown. It can take a whole season for 50% cold damage to grow out, and even then nutrient deficiencies tend to keep the crown from looking prestine. It is a beautiful palm and still well worth growing, slightly hardier foliage-wise than Phoenix delactifera and slightly less so than Washingtonia filifera.
That said your area is about 1/2 zone colder than here and it would take some protecting in Atlanta.