Answer: Since plants in containers are more vulnerable to cold (the roots especially), I'd plan on moving your tree rose to an unheated garage for the winter months. If the temperatures stay at or slightly below freezing there should not be any problem with the roots or with the graft. Wait to bring it in after the plant has gone dormant and the temperatures go into the twenties or so. When in the garage keep the soil just barely moist, more toward the dry side, over the winter months. This will keep the plant dormant and then when temperatures stabliize in the spring you can put it back outside. Enjoy your gorgeous rose!
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