Aeroponics
Aeroponics is a method of growing plants that does not require soil and uses very little water. This may sound unusual, but it is an extremely successful and efficient method of cultivating a wide diversity of plants. This strategy allows you to grow vertically as well as horizontally, which can be a great way to save space. Aeroponics eliminates the need for growth medium completely.
Growers feed the plants by spraying them with a fine mist of nutrient mix on a regular basis. Because the entire structure is enclosed, you save water because the nutrient mix is totally recycled inside the design of the aeroponics system.