20in x 20in Waterproof Seedling Heat Mat
No thermostat required!
This waterproof mat fits neatly beneath 2 standard-size seed flats, raising the temperature of the soil anywhere from 10 to 20 degrees above that of the surrounding air. You can't get much use from it in a zero-degree room, but if you've got a chilly basement or mudroom just perfect for starting seeds, plug in this mat and off you go!
There is no need to use a thermostat with this mat, though if you want to measure the exact soil temperature (for those hard-to-start seeds!), we've got a nifty little thermostat to do the trick. And the mat includes helpful hints printed right on, so you never need root around for gardening books when facing a new seed-starting challenge!
This is the middle size of seedling heat mats, 20 by 20 inches square. Available in single flat and 4-flat size..