Hydroponics
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…flood and drain systems. Most often Rockwool is only used one time.
Perlite and Vermiculite: Perlite is a light white material that is often used in soil. Vermiculite is a flaky shiny substance that is often mixed with Perlite They do not provide enough support for large plants. They are often used when plants are young or seedlings.
Some hydroponic systems do not require any medium at all and use some other means of support.
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