Hardy Palm and Subtropical Board
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How Minors Damage
Posted by Jim Wilmington DE 7a on 6/8/2017, 2:50 pm, in reply to "Re: A couple nice Needles"
Here, they take tip damage in the 8F - 10F range. Frond-wide "pinhole" spotting in the 5F - 8F range. Massive damage in the 3F - 5F range. And 0F to 3F, near 100% death to all opened fronds.
That's how it works here with long duration of daily minimums and feeble rebounds during the day. Also, repeated Arctic events are - obviously - worse than 1 or 2.
Nashville, is, I think, rated 7a (give or take a half zone), but you guys are clearly warmer than a mid-Atlantic 7a with regard to some aspects that are important to marginal plants. Nashville is situated at 36N while Wilmington is nearly at 40N.
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