Originally Posted by Vance Wood

Aruelius: I think perhaps a better answer to your question about incompatible soil masses would be this: In a closed in container this problem becomes just that, a problem, one portion of the soil remaining continually soggy while the rest of the soil has difficulty getting wet enough to sustain growth of any new roots. Attempts to compensate for this phenomonom usually leads to major difficulty for the tree. However in a screened container the conditions that exist are similar to what occurs to a tree planted in the ground. In the many years I have been doing bonsai and landscapes for that matter, I have never once had anyone in the trade suggest that a landscape tree should have the old soil removed and the tree replanted in the same kind of soil as the proposed landscape environment.