Perlite may be the most commonly used growing medium in the world. This excellent product is used by hydroponic as well as organic gardeners. Perlite has excellent "wicking" action yet doesn't absorb water giving the plants roots plenty of oxygen. Commonly used in a mixture with vermiculite. Comes in 4 cu ft bags. Simply Hydroponics and Organics sells only high-quality agricultural grade coarse perlite.
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