Seems like a new non-profit group has sprung up to support community gardens and sustainable, local, food systems:
See also http://www.revivevictorygarden.org/
I am a big supporter of local farming. My 90 year old neighbor Charlie is a good example of how productive a small urban plot of land can be. I made him a Website/blog, check it out: http://koinerfarm.blogspot.com/
I am not much of a gardener myself, but Caitlin does grow some herbs on our balcony. When I was in Guatemala, I had a small garden. I also had some apple trees. All of my neighbors grew corn and black beans. Some grew wheat. Nearby in Almolonga and Zunil, they grew all sorts of vegetables, which could not be exported to the U.S. because of the high levels of pesticides they used.