The Super Sprouter Seedling Heat Mat helps gardeners have better success rates with seedlings and cuttings. Using only 20 watts, it gently warms root areas approximately 10-20˚F over ambient temperature to improve the germination and rooting process. Heavy-duty construction makes this mat very durable. More than 20% larger than competitive mats to allow even warming of an entire standard 10" x 20" tray. More consistent heating with fewer hot spots than other seedling heat mats.