Tiziano:

I have had many individuals bring me trees with root zone problems related to the "fines" in lava stone-based soil mixes. The "fines" seem to create drainage problems.

For this reason, I am not an advocate of the reddish lava stone mixes that I have seen.

I have not used or seen possolana, but I understand that it is chestnut to gray in color, porous, and fast draining. This sounds like it might be a good component for soil mixes.

Cordially,

Michael Persiano
members.aol.com/iasnob



-----Original Message-----
From: Tiziano
To:
Sent: Tue, 27 Sep 2005 22:42:35 +0200
Subject: [IBC] Non organic Yamadori soil


Michael Persiano wrote:

River sand, and Virginia pine bark should be
fine. Equal parts of each should work well. If
you are going to use this mix with fertilizer
cakes, be certain to lightly rake the surface of
the root pad once every 2-3 weeks to ensure water
penetration.

I would suggest that you not use lava stone or perlite for bonsai culture.


Hi Michael
may I ask why not to use lava stone ? what do
you mean by lava stone, the light floating
pumice or the pouzzolane that is more coarse and
heavy ?
thanks

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