What is a substitute for horticultural sand?
What is a substitute for horticultural sand? Pumice and zeolite (or any kind of LECA, lightweight expanded clay aggregate) would probably make a good, inert, insoluble substitute for silica sand, although I personally prefer the more fine-grained texture of growing medium usidng silica sand rather than larger lumps such as perlite (or LECA or pumice). […]
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