I know the problem. But at least you are bringin in small trees. Imagine what my wife looked like when I brought this in, a year before this picture, when it was some 3 ft taller, and with fewer leaves....
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Whenever I decide to not be lazy I'll go ahead and pot a smaller pot around the tubers with course bonsai soil and get some aerial roots
Have you thought about what you are going to do about the fat roots? Start a layer perhaps?