Get a jump start on the growing season with the Hot House with heat mat. It is well known that seeds will often germinate much more easily when provided with a temperature of 10°F-20°F above room temperature. Get started quickly with your own growing media and plugs or purchase them separately for a complete system setup. The Seedling Heat Mat is UL-listed and provides gentle heat that will never damage roots. Includes base tray, 72-cell insert, vented dome, and heat mat Full instructions are printed right on the mat.