Answer: In my experience it is very risky to try to overwinter shrubs or roses in pots outdoors. Even if the top portion of the plant is winter hardy, the roots are not always as cold resistant and can be killed. In adidtion, a hybrid tea rose with a graft will require extra protection for the graft. If possible, it is usually preferable to sink the pot into the ground for the winter, locating it in a spot out of the wind. You could then continue the protection by heaping soil over the bottom six inches or so of the plant. This would be done once the weather has turned quite cold and the ground has begun to freeze. Alternatively you could heap mulch around and over the pot and the graft portion of the plant to try to insulate it. Do this after a hard freeze to deter rodents from nesting there. Another method some people try is to keep the plant in an unheated garage for the winter, setting it outside as soon as the weather begins to moderate in the spring. In all cases, make sure the potting soil is kept barely moist (not sopping wet and not bone dry) at all times. Good luck with your rose, often this is a process of trial and error to find what works best for you.
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