Top 3 Cold Frames - A Good, Easy Way to Harden Off Seedlings

There comes a point each spring when your seedling have grown large enough to move outside, but they're not strong enough to withstand the cold. That's when you harden off young seedlings before planting them in the garden. One of the best and easiest ways to harden off plants is to use a cold frame. Cold frames are structures that insulate young plants when temperatures drop, but allow them to acclimate to the outdoor air and the strength of the sun's light slowly. You could create a cold from bales of hay and an old blanket, but these kits have brought science and convenience to the craft of cold frames.