No, you do not need a greenhouse to use AirGrown Systems. What you need essentially is light and you can use natural sunshine outside or artificial grow lights for inside use.

The AirGrown™ System eliminates the impact of uncontrollable weather conditions —too dry, too wet, too cold, too hot— and greatly reduces the need for herbicides and pesticides. The AirGrown™ System allows for greater absorption of oxygen by the plant root system greatly increasing the growth of the plant, the plant yield, and the longevity of the plant. Please refer to our ABOUT section for further AirGrown advantages.

How many AirGrown System towers that you need depends on how much you intend to harvest. If you want to grow for yourself, you only need one tower. However, if you want to grow food for the whole family, you can start with two towers and move up to ten towers, as needed.