The Kratky method is a passive hydroponic technique for growing plants suspended above a reservoir of nutrient-rich water.[1] Because it is a non-circulating technique, no additional inputs of water or nutrients are needed after the original application, and no electricity, pumps, or water and oxygen circulation systems are required.[2] The Kratky method has applications both for commercial food production and as a small-scale and low-maintenance technique for home growers.[3] It has been described as "the simplest hydroponic system."[4]