Hydroponic gardens do not use regular soil, but they often involve the use of an organic growing medium in place of soil. For example, various types of growing media are often used during the propagation stages of both ornamental plants and plants that produce fruits or vegetables. The grow medium, also referred to as grow soil, can be made of various substances that help anchor the roots of the plants and hold a supply of water, air, and nutrients that the plants need for growth.
Choosing the best grow medium for a hydroponic garden depends on the types of plantsand the watering system that is used. Some plants have more expansive root systems that need to easily spread further so they do better in a loose growing soil. Some hydro growing systems require grow mediums that can hold up to repeated submersions in the nutrient solution without concern that the plant growing medium will dissolve or fall apart after minimal use.