Last spring (1.5 years ago) we planted 3 Windmill palms. We live in SW PA, so we knew it was up in the air as to whether they'd survive here. The first winter we winterized them by tieing the fronds up, putting four stakes around each tree, and wrapping thick plastic around the stakes to keep the worst of the wind off of them. I also wrapped one string of 100 incandescent string lights around each and ran them for 8 hours each evening to help provide warmth.
This past spring (6 months ago) I unwrapped them and found one tree green and healthy, one tree completely dead, and one tree with green at the base and brown fronds. I hoped that tree #3 would recover over the summer, but it hasn't really changed. Now that winter is approaching again the base is still green and the fronds are still brown, and I need to make the decision whether it's worth winterizing.
It takes a fair amount of time to winterize, along with a material cost. I've also installed artificial turf around the trees and winterizing requires four holes in the turf for the stakes. So I don't want to winterize if the tree is not going to recover. However, if there is a substantial chance it will recover I'll do the winterizing.
Is this tree still alive and how likely is it that it will recover and put out new fronds in the coming year?