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I got this very unruly BRT as a birthday present in late may. I've had it indoors in a south facing window. Humidity tray. It's had a lot of growth of the last month, after some inspection there are roots coming out of drainage holes in the nursery pot. It appears to have been re-potted once due to the exposed roots. Should I wait until next spring to re-pot or if would handle the re-pot this late in the summer. Also, if I do re-pot should I go with a shallow display pot or just move it into a bigger deeper growing pot. Thanks!

Not sure why you are asking this on a bonsai forum?

The goal is to turn in this pre-bonsai into a bonsai.

You can repot a BRT in the summer if your growing season is long enough, but better in the Spring. Don't put it in a bonsai pot yet.