The term growing on substrate is often used incorrectly. A substrate is synonymous with everything that a plant can grow in or on. The substrate, or growing medium, serves to keep the plant in place as well as provide an environment the root system can function in. Examples of substrate are potting soils, coco and rock wool.
There are basically two methods of cultivating with substrate; run-to-waste and recirculation. In a run-to-waste cultivation system the feed water passes the roots just once and is then disposed. This is in contrast to re-circulating systems, where the drainage water is reused.
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