Organic food grows on acre of New York City rooftop

Brooklyn Grange, an organic farming business, is using a 40,000-square-foot rooftop (nearly an acre) in Queens to grow hundreds of thousands of plants. Its website says tomatoes are among its biggest crops but it also grows salad greens, herbs, carrots, fennel, beets, radishes and beans. It farms nine months of the year, using cover crops like rye, buckwheat, vetch and clover in the winter.