Answer: The high grafted tree roses -- including Knock Out -- do need special care in your cold winters. The graft needs to be protected from the cold. The best is to bring it inside to a cool dark place for the winter, somewhere like an attached garage or unheated basement, with temperatures between about 35 and 45 degrees. Bring it inside in late fall once it has gone dormant, and water just enough to keep the soil from going bone dry while it is indoors. Then take it back out in the spring to wake up naturally with the season.
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