I collect yamadori pines, firs, spruce, and larch in the mountains outside of town here. I have always had a problem bringing these home with 40-60% native soil around the root ball and then potting up in a grow pot using good bonsai soil. So now I have native soil in the middle, and bonsai soil all around that. The native soil retains moisture longer than bonsai soil and probably doesn't drain as well, so the whole picture there does not seem right to me. I end up adding so high grade potting soil, like "Happy Frog", to the bonsai soil trying to make the soil more consistent, which is the way some articles say it should be. I can't say I've had any problems with this method and would just like input on what others might do in the same situation. Maybe I should be doing it a little differently.