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Originally Posted by bisco_bonsai
In a sense, by placing soil first in a bonsai pot, might we be only producing a micro perched water table for our tree ...
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Exactly.
Now given the depth of the course material and the position of the roots on top of that, where exactly is the perched water at? Right where it does the tree the most good?
In uniformed size mixes there is always a perched table at the bottom of the pot. Water gushes through and dries very quickly from the top down (in most cases) while the bottom of the pot remains wet.
Using layers we move this perched water table up to root level and also at a level that is easy to check for moisture. Overwatering problems? No more than any other arrangement, you only water when the soil needs it.
Just my thoughts,
Will