Answer: This is a very hardy plant, so if it is large enough it would be best to plant it in the ground. Although it may be too cold for good top growth, the roots will continue to grow until the soil cools off dramatically. Depending on the size of your plant you might want to go ahead and plant it and mulch it well, or you might want to overwinter it in the pot. If you leave it in the pot, keep it in a sheltered location with some insulation around the roots (a coldframe would be ideal) and then plant it out in early spring as soon as the soil can be worked.
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