Hi, welcome to GoY, when you say Mimosa, do you actually mean 1 of the 400 species of Mimosa ?, or the florists Mimosa, which is actually Acacia dealbata, which is a bit hardier than a true Mimosa, it being half hardy and can tolerate temperatures down to freezing for short periods, whereas true Mimosa can't stand any lower than 55 - 61f, but actually whichever 1 you have, I would leave it till spring to repot, if you do it nowyou will have a lot of cold compost with no roots in it all through winter, which would make it even more vulnerable to frost damage, if we get a severe winter I would suggest that you put it in a greenhouse if you have 1, or conservatory, anywhere that is reasonably frost free, with good light. Derek.

One other possibility for Mimosa, Albizia julibrissin.

Hi Tug, forgot about that 1 lol, Derek.