It's not just what they grow, but how they grow it and sell it. The soil on many mid-country farms is bad because of years of growing with chemical pesticides

It's not just what they grow, but how they grow it and sell it. The soil on many mid-country farms is bad because of years of growing with chemical pesticides and fertilizers and bad practices, something that is potentially reversible with alternate growing methods. Commodity growers on huge farms distribute their food into large grocers potentially all over the world, to be sold at the lowest possible price. They must maximize yields at any cost to make money. Specialty growers sell into farmer's markets, CSA's, etc, at a much higher cost for the goods. This is why many of them are in coastal and affluent areas, where the buyers are willing to pay considerably more for local, fresh produce that has been grown organically.