“The Kratky method has no moving parts. It requires no electricity (so long as natural light can be provided), and it is the most inexpensive system to build and run. ✓    The Kratky method is achieved by hanging plants in net pots above a nutrient solution. As the plants drain the solu- tion, more room for oxygen is created to provide plenty of air to the roots. ✓    Since there are no moving parts and little maintenance, the Kratky method can be thought of as a “set it and forget it” approach to gardening.”