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Close-up of vermiculite, magnified 10x Vermiculite, like perlite, is used to help prevent soil compaction, promote aeration, and retain moisture. Like perlite, it is a natural mineral is greatly expanded by heating in a furnace, resulting in a light-weight, water-retaining, pH-neutral, sterile and weed-free product.

Vermiculite crushes and degrades more readily than perlite, though still very slowly. In the process, it releases potassium and magnesium.

These properties makes vermiculite ideal for use as a soil additive, or as a sterile rooting medium. It also makes an excellent hydroponic medium.

Please note that, while pure vermiculite is non-toxic and does not contain asbestos, vermiculite as mined in locations like Libby, Montana can contain asbestos. This site is no longer operational. Since the 1990s, vermiculite mines across the world are regularly checked for this material. Still, I would use only recently-produced vermiculite from a known source, and one you trust ...

Close-up image of vermiculite, magnified 60x

Topics Referenced

Rooting Hormone

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