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Consider hydroponic and aquaponic gardening.

Hydroponics involves growing plants without soil, however hydroponics, in its simplest form, is growing plants by supplying all necessary nutrients in the plants’ water supply in a nutrient solution rather than through the soil.

In Aquaponics, the nutrient solution is water containing fish excrement. Aquaponics is the integration of hydroponics and aquaculture (the cultivation of the natural produce — like fish or shellfish — of water). The fish excrete their waste into the surrounding water, which is used to supply nutrients to the growing plants positioned above the tank.

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