Here is a link to the Houston based, "Urban Harvest" (http://www.urbanharvest.org/ ) community garden group as listed on the American Community Gardening Association website. ( American Community Gardening Association )
Additionally, an overview of Community Gardening in your state and region, please go to the links page of the ACGA site ( http://www.communitygarden.org/links/index.html#Gardens )
The ACGA website contains the gist of 25 years of community gardening in sthe United States and Canada, and well deserves careful reading.
Clinton Community Garden