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Protecting a Rose of Sharon in the Winter?I live in Toronto, Ontario, Canada; this is located in the ''Zone 5-B'', I believe. We have a cold winter with 3 to 4 major snowfalls, and a damp type of cold, being next to the north shore of Lake Ontario, in the Golden Horseshoe. The temperature will drop to an average of -25'C to -35'C (-13 to -31 F) between early January and late March. Should I pot the plant and bring it indoors?