A raised garden box differs from a simple raised garden bed in that it has a bottom and it is generally smaller. Raised garden boxes are most often used for flower beds, but can be used for vegetable plants as well. The best thing about these types of planters is that they are movable. Place them on your patio, deck, by the front door or even scattered throughout the landscaping or garden.
Measure 2 feet, twice, on the lumber. Mark and make the two cuts with your pencil and saw. These are the front and back pieces to the raised garden box. Measure 8½ inches, twice on the remaining lumber. Mark and make the two cuts. These are the two end-sides. Cedar and redwood are two excellent rot-resistant woods to use for outdoors.
Set the cut boards on their edges, so that they create a standing up frame. Place the longer, front and back pieces parallel. Put a side piece at either end, inside the longer boards.
Attach the frame by drilling in 1½-inch screws with a drill and screwdriver. Screw four or five screws in, across the outside of each end of the front and back boards. The screws will go all the way through the top boards and into the edges of the shorter, side boards. The outside measurements of the frame should be approximately 2 feet long and 10 inches wide.
Measure the outside of the frame, for an exact measurement. Draw this measurement onto a piece of plywood. Cut around the markings.
Place the cut plywood over the top of the frame. Attach it with ½-inch screws, going through the plywood and into the edges of the frame wood, all the way around. Place a screw about every 4 inches.
Change the screwdriver attachment to a round drill bit on your drill. Make holes randomly through the plywood, for draining excess plant water. Turn the box right-side-up.