The Physics of Space Gardens

Check out this actual NASA photo of a plant growing in 3-D found at:

Ref:

http://science.nasa.gov/ppod/y2003/21apr_greenbubble.htm

Another link explains the bio-sustainment that I'm using in Green Gardens in Space; Future Cities

Ref:

http://science.nasa.gov/headlines/y2001/ast09apr_1.htm

Where you'll get an explaination for this diagram: