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Aiflanc, the general rule is if you grow anything in a pot the stuff it is growing in should be the best potting soil you can get. Compost is good for gardens but in pots it has to be the best....probably to there are a lot of roots in there with nowhere to go....So yes I would repot it when it gets a little warmer.....if it has new growth, you could probably do it now into the next size pot.....also if there are roots coming out of the bottom of the pot then this is another sign thar it needs a bigger pot.....good luck...