Answer: Your Japanese Wisteria is winter hardy in Michigan and can safely remain outdoors. However, since it is still in a pot, I would worry about the roots being overexposed to cold temperatures. How about sinking the pot in the ground for the winter? Or, wrapping with insulation to keep the roots from freezing solid. It isn't necessary to set it in the breezeway - leave it out in the yard - or in a flower bed close to the foundation of your house - and sink the pot into the ground. It should winter over well.
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