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Vermiculite is a natural mineral often used with another growing medium to solidify a hydroponic growing setup.
Other hydroponic growing mediums include Rockwool, Clay pellets, Coconut fiber, and Perlite.
Learn about growing hydroponically:
More grow medium definitions:
Grow medium | Soil | Seedling & Cutting soil | Hydroponic | Rockwool | Clay pellets | Coconut fiber | Perlite | Aeroponic