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The process of growing plants in sand, gravel, rockwool, or liquid (but with no soil), with added nutrients recirculated through the water.

The advantages of hydroponics do NOT include:

The symbiotic cultivation of growing plants without soil (hydroponics) and fish farming in a recirculating environment. Plants use the metabolic waste of the fish, and the fish use the water cleaned by the uptake of plant nutrients. Each benefits from the other.

The practice of using small pipes that slowly drip water just above ground and directly on the plant's roots to conserve water in greenhouses (and in raised beds or open field systems).