Answer: Ensete Red-Leaf Banana is one of the hardiest of all ornamental banana trees and it should do well in your growing zone. I suspect the yellowing foliage is typical for winter time. These plants will stop growing when temperatures reach 50F and will freeze down to ground level if temperatures tumble below 32F. But, the roots will send up healthy new shoots the following spring. You may want to wait until growth begins in the spring before doing anything. If the tops of your plants look really bad, simply cut them off at soil level. If they develop new foliage that covers up the yellowing foliage, you can simply remove the old leaves. You can also begin fertilizing in the spring which should help your plants produce red leaves. For best color, make sure your plants receive full sunshine.
Best wishes with your landscape!
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