The 4 ft. x 4 ft. Raised Garden Bed from Lifetime Products allows you to build your own raised garden bed and create the perfect garden setup in less than one hour. It is constructed of UV-protected high-density polyethylene (HDPE) with a simulated wood design. It is low-maintenance, weather resistant, and will not rot, crack, or peel. The walls of these tall raised garden beds are 9 inches high, and two beds can be stacked together to create 18-inch walls to accommodate deep rooted plants. The Early Start Enclosure should not be used during the winter months. The Early Start Enclosure protects the seedlings in your tall raised garden bed from frost and other outdoor elements. It is constructed of clear plastic vinyl with a double door design. The exterior door made of clear plastic, and an interior door made of netting. The plastic door can be tied back during warm days and the net can tie back to allow for insect pollination. The enclosure should not be used during the winter months to ensure maximum satisfaction. The enclosure is best used during the early spring to protect the garden from the risk of frost. With its do-it-yourself assembly and low-maintenance features, you can build your own raised garden bed in no time!