Hardy Palm and Subtropical Board
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The Trachy and Palmetto had two bottomless trashcans, taped together, end-to-end over it, plus a deep leaf raking fill. The top was left open except for when temperatures below 20F. No additional/artificial heat was provided.
What this means is at night, temperatures inside the shelters were the same as outside. However, the shelters allowed for a more robust temperature rebound during the daytime, especially if the day was not overcast. The shelters obviously ameliorated any damaging effects from wind that the other palms (unprotected by shelters) dealt with.
I'm always torn every year. I wonder -- quite seriously -- if the shelters are a net gain or deduction for the two palms I use them on. I believe there is a downside to the quick warmups. A dowside to daytimes where it might get to 50F or warmer in the shelter for 5 hours, and then for the 15 hours of winter darkness, there is no temperature advantage in the shelters. So, in 24 hours, these plants could see 55F and 5F, for example. I can't think that's entirely a good thing.
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