![]() Seedling heat mats come in a variety of sizes, with the most common being 10 inches by 20 inches, which corresponds with the size of a standard plastic growing tray. The mats are easy to wipe clean with just a damp cloth and will resist rusting and corrosion. The outer layer is sealed to protect the internal heating elements. The mats feature multiple layers of flexible waterproof plastic or PVC that encase heating wires or heat-conducting film. Today’s seedling heat mats are designed to resist spills, surface moisture, and the high humidity levels associated with starting seeds and growing seedlings. Expect to pay about twice as much for an inclusive grow kit that comes with a heating mat and a humidity dome. The domes keep the medium and new seedlings moist and protected. Growing system: For those wanting a more inclusive approach, heat mats are also available with grow kits that feature humidity domes.A single mat is not expensive, depending on its size and accessories, and it will raise the temperature of the growing medium by about 10 to 20 degrees Fahrenheit. ![]()
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