This Dirt Genius 12 x 48-Inch Propagation Mat provides bottom heat that enhances germination and rooting. This seeding and propagation mat is 48 inches long and ideal for placing 2 standard trays end to end. It warms the rooting area to 10 to 20 degrees above ambient temperature. Place it under a 4-foot fluorescent fixture and ensure the bottom surface of your trays will be heated uniformly. Daisy chain up to 10 mats to reduce the number of power outlets being used and run multiple mats to a single outlet. The heavy-duty construction allows you to use the mat reliably for years on end. Heat is essential for effective sprouting, so grab a Dirt Genius 12 x 48 Inch Propagation Mat and watch your plants flourish.