This heating mat is designed to help give seedlings a kick start in the rooting process. The strong heating wire and thick multi-layer construction offers more uniform heating and the durability to withstand rugged greenhouse environments. This waterproof mat is the only UL listed seedling heat mat on the market and increases the success of seedlings and cuttings. Warms root area 10-20 degrees over ambient temperature to improve germination. Give your plants a boost with the HydroFarm Heat Mat.