Vermiculite is a soft, spongy material made by super-heating phyllosilicate minerals. Sterile, pH neutral, clean, odourless and non-toxic, it doesn’t rot or mold. It’s the prefect amendment to to heavy soil, retaining air, nutrients and moisture, releasing them as the plants need them, and creating air channels to allow drainage and root aeration. It can be used alone in hydroponic applications, or mixed with peat moss for germinating seeds.

Pro-tip: Vermiculite doesn’t have any nutrients or trace elements, so don’t forget them:
Horticultural Vermiculite has the excellent property of improving soil aeration while retaining the moisture and nutrients necessary to feed roots, cuttings, and seeds for faster growth. Like perlite, horticultural vermiculite is permanent, clean, odorless, nontoxic and sterile. It will not deteriorate, turn moldy or rot. The pH of vermiculite is essentially neutral (7.0-9.5) but owing to the presence of associated carbonate compounds, the reaction is normally alkaline. It also will vary (become more alkaline) with changes in processing techniques and time, and with the presence of moisture. The pH, color and chemical composition of vermiculite also will vary from mine to mine.

Coarse Grade.