May 06, 2009 — It's gardening season and we're heading into the peak week for many garden centers and nurseries. A St. Lawrence County greenhouse went greener this winter when owners switched from oil to a type of biofuel heating system. Wheat's Greenhouse has been a gardening mainstay in Edwards for more than twenty years. But when fuel oil prices rose last fall, Bill Wheat took steps to help save money and the environment. Wheat collects used cooking oil from restaurants in Gouverneur for use as fuel in a boiler. It's a bit of an experiment, but he says, so far, it's worked in three of his six greenhouses. Todd Moe took to a tour in late February to find out more about a place where used vegetable oil kept veggie and flower seedlings warm this winter.