Sand for potting mixes

Sat, 15 Nov 2014 14:43:20 PST

>So, I suspect that calcium carbonate sand might change the pH, and that is 
>why it is undesirable for potting mixes?

Probably, but my guess is that saying "silica sand" is a hedge against 
potential outrage from one or two customers who might have expected 
aragonite and gotten silica sand instead.
I use sand (silica sand) to add weight to seed pots left outdoors, to 
prevent them from being blown away, and pure sand to grow cactus seedlings 
after initial germination in a regular mix (peat, perlite, sand, calcined 
clay, whatever).
And I never use turkey grit without tasting it first ....


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