Sally,
As long as it is still dormant it's ok. But once buds have broke I wouldn't recommend it. things that are in pots can be transplanted anytime. But if you have to cut roots then moving while dormant is best. Have the buds broke? is it starting to leaf out?
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Thanks Mark, confirmed what I suspected. There are no leaves yet but it's definitely starting to break bud. Luckily there isn't any rush-I'll just have to be patient.
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