Perlite may be the most commonly used growing medium in the world. This excellent product is used by hydroponic as well as organic gardeners. It has excellent “wicking” action yet doesn’t absorb water giving the plants roots plenty of oxygen. Commonly used in a mixture with vermiculite or Coco Peat.
Perlite, made from processed granules of volcanic rock, has excellent capillary properties and doesn’t compact, which allows for good aeration.
Used in pot culture or with drippers, it is one of the best hydroponic growing mediums around.