Dry-stall vs Horticultural pumice ... was algae and moss in seedling pots

David Moore david.moore@neudorff.com
Wed, 18 Apr 2012 07:53:35 PDT
Hi, I ran into this thread and want to offer a clarification: as I
understand it, Dri-Stall is technically a 'calcined clay' (fired but not to
the point of full vitrification).  This is why the material does not break
down like aggregated clay in its natural state.  The physical
characteristics of the clay ensure that it retains its high CEC after firing
(which also burns out any organic matter.)


I am looking for insight and observations (or even better,
scholarly/technical references) that might guide me on choosing proportions
of calcined clay and horticultural pumice when preparing a media for
long-term container growth of specimen plants.  Here locally (Santa Cruz
County, CA) some of the bonsai enthusiasts are HUGE advocates for Dri-Stall,
I have them to thank for turning me onto this material.  If these folks
trust their precious plants to Dri-Stall I consider this a solid


I appreciate any insight and suggestions, thanks very much!


Dave Moore

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