There's a great article, Urban Farmers' Crops Go From Vacant Lot to Market in this week's New York Times, on crops growing in unexpected urban places.

Pull Quote:

This urban agriculture movement has grown even more vigorously elsewhere. Hundreds of farmers are at work in Detroit, Milwaukee, Oakland and other areas that, like East New York, have low-income residents, high rates of obesity and diabetes, limited sources of fresh produce and available, undeveloped land.