research on wikipedia and dictionary.com brought me this:
- hydroponics---Hydroponics is crop production with mineral nutrient solutions instead of soil containing silt and clay. Terrestrial plants may be grown with their roots in the mineral nutrient solution only or in an inert medium, such as perlite, gravel or rockwool. A variety of techniques exist. (wikipedia)
- hydroponics--the cultivation of plants by placing the roots in liquid nutrient solutions rather than in soil; soilless growth of plants. (dictionary.com)
- organic--noting or pertaining to a class of chemical compounds that formerly comprised only those existing in or derived from plants or animals, but that now includes all other compounds of carbon. (dictionary.com)
Check out http://en.wikipedia.org/wiki/Hydroponics for more really insightful information that you might find interesting.