In a message dated 5/22/2005 9:41:41 AM Eastern Daylight Time,
writes:

perlite breaking down. It is an air-popped volcanic rock &
stays for years.

Agreed

I wouldn't use it in bonsai soil because it floats to the surface, but
many people find it useful. Vermiculite does break down. It turns to mush in
short order. I would never use it in bonsai soil, but I imagine some people find
it appropriate.

Some commercial soils come with both Vermiculite and Perlite. You are
correct that vermiculite turns to mush.

Billy on the Florida Space Coast

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