Wild greens are everywhere. They don’t need you to water them, and they grow like crazy in most man-made environments. Many of the plants that are now considered weeds were once food and medicine for us. They can still feed and heal us, but we gotta get over that weed vs. food idea.
The first step is just to notice that greens are growing everywhere, free for the taking.
How about having your dream house in the country right here and now, in the middle of the city? Eco-Libris blog reviews 'The Urban Homestead - Your guide to self-sufficient living in the heart of the city' by Kelly Coyne and Erik Knutzen.