Worried about crazy food prices? Killer tomatoes? Armed with a BlackBerry and a sarcastic wit, urban farmer Mary Seton Corboy is showing Philadelphia that the ­solution might be right beneath our feet

PHILADELPHIA — Amid the tightly packed row houses of North Philadelphia, a pioneering urban farm is providing fresh local food for a community that often lacks it, and making money in the process.

Greensgrow Farm is a little bit country and a lot urban. Situated on the reclaimed - and cleaned up - site of a former steel-galvanizing factory in Kensington, the nonprofit organic farm grows a wide variety of produce, including heirloom lettuces, peppers and tomatoes, and also acts as a crop clearinghouse for small farmers from South Jersey to Lancaster County.

An urban farm in the Kensington section of Philadelphia will get some attention during a food extravaganza Saturday at the Oxford Valley Mall in Langhorne, Bucks County.

Philadelphia's Kensington section is an unlikely place for a farm. Surrounded by asphalt, hemmed in by an elevated interstate highway (I-95), and framed by row houses, Greensgrow's one-acre farm provides a little postcard of green in an otherwise bleak urban landscape. This community supported hydroponic farm has been making a name for itself in the Philadelphia area--and far beyond.