The 4 ft. x 4 ft. Raised Garden Bed from Lifetime Products gives you the perfect garden setup in 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, but two beds can be stacked together to create 18-inch walls to accommodate deep rooted plants. With its easy do-it-yourself assembly and low maintenance features, gardening has never been this easy.