Mr.Garden 24Pack Wall Water Season Extender Water Filled Garden Teepee for Frost Snow Protection, Green Wall-o-Water protector is a simple and effective way to keep young, tender plants warm and protect against frost, heavy snow, harsh temperatures and even cold winds 18inches height, can protect 26-in diameter area. Eighteen rings of interconnected vertical plastic tubes filled with water, provide a warm summer-like growing environment Absorb heat during the day and dissipate heat at night to keep the plants warm from the cold to extend the season or start early gardening, the water filled baffles can also serve as insulators to keep the plant warm Open the tubes and put water in, about 2/3 full, then place the filled teepee over your seedlings and it sits like a teepee or a litter greenhouse Early sow, early harvest, make planting easier, superb early plant protection