A wicking material draws nutrients up to the roots or the root tips are suspended in a stationary solution with the main portion of the rootball hanging in the air. Most operate on timers, alternately wetting the medium to wash out salts and replenish nutrients and then draining so the plants can draw in atmospheric oxygen. Water culture systems usually operate without media. Sometimes rockwool cubes or small amounts of gravel are used because plants like tomatoes and cucumbers get top heavy when they start to bear fruit and may need help to stand upright. You can also use plastic flaps, foam rings, fiber cups, or plastic collars for plant support.
Some growers tie plants to a trellis.
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