Ben Flanner in the hoop house at Brooklyn Grange. Over 20,000 seedlings are getting their start in the hoop house. They'll be planted in the beds at the Grange's Long Island City and Brooklyn Navy Yard rooftop plots in the coming weeks.

Ben Flanner, founder and head-farmer at the Brooklyn Grange rooftop farm. The Grange is expanding to a second one-acre roof in the Brooklyn Navy Yard, and expects to harvest 30,000 pounds of produce this ...