bencelest

If you want it to fruit and have a big banana right away next spring, I would just wrap the pstem with cloth or something that is breathable or dig the whole thing and let it hibernate inside your garage in the winter time. The main thing is to protect the pstem from frost.
Scroll down in this forum and you will find pictures and advices that will suit your needs.
Cutting it down to the base each year I would not advice it, as Taylor said you are inviting root rut to the corm. Or just leave it alone or protect it .

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Banana Nut