I just acquired a very nice root over rock trident maple in a shallow oval pot. The diameter is about 1"-2"at the base. It is unfortunately root-bound, with the soil pretty much decomposed into organic matter, and a lot of the roots exposed and 1/3 of the soil missing.
November is a good month to repot it; should I wait or repot it as soon as I find a suitable pot? How should I maintain it in the meantime? I hate to waste good potting soil by using it to fill out the missing potting material, but perhaps there is no other choice.
It is currently in a dark brown unglazed oval pot, set asymmetrically. Through reading on the web, I have learned that the classic color for a maple is a cream glazed pot. Should it be rectangular or oval? Do I want to go to a smaller pot or larger?
Can I use a premixed bonsai soil or is there a particular formula to use?