In a message dated 3/29/05 12:02:26 AM, Mathias Uely writes:
granite* with sharp edges(very important) and you* will get the same risult
,& with no problems of soil that might get clumped and the roots will split
more easily* and grow dense

This is a myth. The forces that promote root splitting occur at a molecular
level & have nothing directly to do with the shape of the soil particles. In
addition to water & nutrients, the soil must contain air. The soil particles
that promote the most air would be as round as a ball bearing. Crushed granite
chicken grit with its sharp edges makes a good bonsai soil component, but so
does aquarium gravel with rounded edges.
Iris

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