Can I leave my banana tree
in the ground for the winter?

In a banana tree it is the root that you want to keep. Digging it up for the winter will protect it from freezing and from root rot. It can be kept in the corner of the garage. There are hardy bananas that do not need to be dug up. Some are hardy to -10˚F.

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Related Resources:
Landscape - Hardy Banana
Banana Growing in the Florida Home Landscape
Banana Plants Add Tropical Accent to Landscape