Check out this growing method

http://www.globalbuckets.org/

Benefits of the 2-bucket system:
1) 50% to 80% reduction in water usage.
2) 100% reduction in weeds...never pull a weed or use herbicides.
3) Once planted, very little attention is required.
4) Foolproof: People with very little training (like us!) can reap bountiful harvests.
5) All you need are a few square meters of space...even rooftops, industrial wastelands, etc

Click on link for the rest

neat idea, thanks for posting