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They like well draining, damp soil and frost free though are hardy. They do well in wet western Scotland and Ireland and progressively worse the further east you go. They were on sale as they are not as hardy as the normal Cordyline austalis.
Keep it in the pot until spring, as you want to avoid overpotting with its problems of root rot. It would actually prefer to go in the ground - it should turn into a lovely tree within 5 years.
CG I agree with blairs don't re-pot. If you have a greenhouse I'd take it inside. If not I'd try to give it shelter and stand it in a bigger pot, or maybe two more pots and cover it with fleece when the weather is really cold. Keep the pot off the floor so it can drain.
CG it should be frost free in there, but fleece it if really cold. Not wanting to teach you to "suck eggs" but in winter if it's sunny your GH will get very warm & moist so you'll need to open the door...be careful I did that & forgot to close it and it blew away.
Keep in touch and tell us what else you grow.