Growing Palm Trees in Zone 3-4
I've sucessfully grown several palm trees and banana plants for over 10 years with winter protection by building styrofoam boxes and giving them minimal heat from a couple of flourescent light bulbs. I have an 8' foot windmill palm, two 6' Mediterranean fan palms that produce seed, and a younger pindo palm. Usually we see -20 F. winters and one winter had -39 F. They are all very healthy. Has anyone else tried palms in zone 3-4, and what methods have you used to keep them alive? I keep in touch with someone 80 miles south of where I live near Salt Lake City and he keeps 20' palms alive with bubble-wrap and christmas lights. Any other ideas?