when one repots especially from nursery stock to smaller pots does one have to remove all the old soil or can a pocket of it under the trunk itself be left on till the next repotting?

another question I had was with some soil mixtures being up to 3/4 inorganic (as for junipers) and with the regular application of fertilizers, why would it be necessary to change the potting soil every repotting time? Does the inorganic portion get used up(I'm using granite grit). I'm not talking about the stuff which would fall down during the repotting process but to the bonsai mixture held within a rootball that had been reduced in size already. I haven't reached that stage yet. For all I know all the "soil" would fall from the roots if you give it a shake with the particles being large.
rob v.

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