Wisconsin. Two years I received a wonderful gardenia plant- Help!

and it would produce one or two blossoms each summer when I placed it outdoors. Since the plant (tree) grew quite large I decided to permanently plant it in the garden. It is beautiful and had six blossoms!!! My question is can I leave it outside in the ground over winter? It has gotten so big I just don't have a place for it in the house. What can/should I do????

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