The importance of growing food is overwhelming to me. I think it is the first step in finding your own independence. There is no way you can get away from the will of the centralized food system and the big name corporations that produce most of the food in the nation. Once you are caught in their wheel its nearly impossible to escape, unless you start growing and raising your own food. This means you are stuck with the price and quality they offer.
Urban gardening changes everything. Suddenly people in cities have the ability to take that freedom back. Gardening is especially hard in condos and apartments and this article has some advice for those who are confined to these spaces. Aside from growing, start solidifying relationships with farmers at your local farmers markets.