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Coconut fiber is the husk of the coconut. It can be used as a growing medium for hydroponic growing.
Other hydroponic growing mediums include Rockwool, Clay pellets, Perlite and Vermiculite.
Learn about growing hydroponically:
More grow medium definitions:
Grow medium | Soil | Seedling & Cutting soil | Hydroponic | Rockwool | Clay pellets | Perlite | Vermiculite | Aeroponic