This method allows you to easily alter your garden, adding or removing plants as you wish without affecting any of the surrounding crops. Like other methods, the basic concept is very simple–plants are placed in a tray, which is periodically filled with nutrient-rich water pumped out of a reservoir below. The system uses gravity to return the water to the reservoir to be reused. This system seems complex to beginners because it involves so many different components, but they all come together quite easily and can be assembled in very little time. Once assembled, this system needs little maintenance and produces plants efficiently with very little electricity or water use.