The 4 ft. x 4 ft. Raised Garden Bed from Lifetime Products gives you 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 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 enclosure is best used during the early spring to protect the garden from the risk of frost. With its easy do-it-yourself assembly and low-maintenance features, gardening has never been this easy.