University of Maine Cooperative Extension expects to open its Greenhouse Plastic Recycling (GPR) program April 19 with drop-off sites available statewide through November 21.  Plastic eligible for recycling is clear, low-density polyethylene #4 (LDPE #4) used to cover greenhouses, high tunnels, hoop houses and other agricultural structures. The program will also accept white overwintering plastic read more UMaine Extension greenhouse plastic recycling program opens April 19