Hydroponic growing requires some form of inert growing medium to support for plant and protect roots from sunlight. Many different media are used for hydroponic gardening, but all must provide the following:
- Physical support for the plant.
- Free passage of moisture (nutrient solution) to the root zone.
- Proper drainage of surplus moisture.
- Adequate air circulation to roots.
Typical Materials Include:
- Coarse sand, such as washed river sand--not beach sand.
- Gravel, 1/8"-3/8" (3-10mm) in diameter.
- Perlite, screened grade
- Vermiculite (can also be mixed with other media to increase water retention)
- Expanded Clay
- Rockwool
American Hydroponics - www.amhydro.com
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