vermiculite - Knowledgebase Question

san jose, Ca
Question by aimsmalditz
September 22, 2009
hi! how is the proper use of vermiculite? is it ok to put more vermiculite on potting soil i just bought?

Answer from NGA
September 22, 2009


Vermiculite, and its substitute Perlite, are both naturally occuring minerals that are heat treated and expand to 20 times their original volume. They are both inert and help soil-less mixes retain water and aerate the mix. The only real difference is that vermiculite breaks down a little sooner than perlite. You can add vermiculite to your potting soil, but don't go overboard. Vermiculite will float to the surface if your potting soil mix is too light!

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