The simplest and most common hydroponic method is using drip irrigation to deliver nutrient enriched water to plants grown in rockwool slabs. Many commercial tomato and pepper growers use this technique since it is relatively low-maintenance and can generally deliver foolproof results although it does produce runoff. In this photo, taken at Nipomo Mesa Farms in Santa Maria, CA, rows of tomato plants are supported by strings in a method called air-layering. As the fruit is harvested off the bottom of the plant using this method, the growing vines are coiled around each other much like a rope is coiled on the ground. Air layering allows single vine plants to reach 40 feet in length in some instances.
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