New Growers Supply Company GSHML 20-3/4-by-48-Inch Large Seedling Heat Mat

This seedling heat mat is 20-3/4-inch by 48-inch (Model # GSHML) is designed to fit under four of our Perma-Nest 22-inch by 11-inch plant trays (GW2211, GT2211, GS2211) or four standard seed flats. Warms the soil in the tray 10-20 degrees Fahrenheit above the room temperature, helping seeds to germinate and grow faster. 20-3/4-Inch by 48-Inch Warms root area 10-20-degree F over ambient temperature