Growing medium
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1. The soil, sand or other material in which plants have their roots, and from which they are drawing water, air and nutrients.
https://i2.wp.com/www.nosoilsolutions.com/wp-content/uploads/2014/08/grow-medium.jpg?resize=736%2C276
Seven different types of growing medium.
Source: http://www.nosoilsolutions.com/7-different-hydroponic-grow-mediums/