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Hydroponic Propagation Media Rock wool, peat, coconut coir, Perlite, and aquarium gravel are just some of the types of propagation media that can be used when starting a hydroponic garden.
These hydroponic media take the place of the soil that regular gardeners use to grow their plants. When setting up a hydroponic garden it is important to research the best type of growing media for the type of system that will be used to supply the nutrient rich solution that is the backbone of hydroponic gardening. This is especially true when a closed system, which recycles the nutrient solution back to the plants, is used with rock wool and perlite as the grow media.
Toxic salts can develop and cause damage to the plants. In addition, knowing the best propagating media for the type of plants that are going to be grown is important because some plants will propagate better with different media.