Aeroponics and hydroponics are great alternatives for growing plants in small spaces---especially indoors---making this method of growing plants especially suited to urban dwellers. Aeroponics is similar to hydroponics, as neither method uses soil to grow plants; however, with hydroponics, water is used as a growing medium. When plants are grown hydroponically, their roots do not find it necessary to seek out the required nutrients for survival. Instead, they are provided with all the necessary nutrients for strong, vigorous growth directly. As a result, root systems are smaller and plant growth is more abundant. In aeroponics, no growing medium is used. Instead, the roots of plants are suspended or hung in a dark chamber and periodically sprayed with nutrient-rich solution.