Here are some links to groups that can help you grow food off-grid:

Thrive

Green Thumb Community Gardens

Am. Community Garden Assc.

Neem Foundation

Trees for Life

Living Nutrition

Institute for Simplified Hydroponics

Growing Solutions

Effective Microorganisms New Zealand

Acres USA

Growing Bio Intensive

Oregon Tilth

Permaculture Association (Britain)

Naturewise

Educational Concerns for Hunger (ECHO)

Biodynamic Agricultural Association

Health Masters

P-Patch Community Gardeners Seattle Tilth
Green Grid Roofs Eco-Roof Systems

Miller Roofscapes

ZinCo Living Roofs Watts Garden Club – Mag. article Organic Farming will feed the world

Organic technology