Measure, mark and cut four pieces of 4-inch by 4-inch lumber that are 6 inches long. These are the legs of your raised planter.
Measure, mark and cut 8 pieces of 1-inch by 4-inch lumber that are 24 inches long. These are the side framing pieces.
Measure, mark and cut 2 pieces of 1-inch by 4-inch lumber that are 14 inches long. Measure, mark and cut 2 pieces of 1-inch by 4-inch lumber that are 22 inches long. These are the bottom framing pieces.
Measure, mark and cut 4 pieces of 1-inch plywood that are 24 inches square. These are the sides of your planter.
Measure, mark and cut 1 piece of 1-inch plywood that is 23 inches square. This is the bottom of your planter.
Arrange the bottom framing pieces together to form a 23-inch square. Position the bottom on top of the square. Screw the bottom to the frame in each corner and every 6 inches.
Spread the sides of the planter out. Position a framing piece at the top and bottom of each side. Secure the framing pieces to the sides using wood screws spaced 6 inches along the horizontal middle of each framing piece.
Position the sides around the bottom piece. Secure the sides to the bottom and to each other using wood screws spaced every 6 inches.
Position one leg under each corner of your planter. Secure the legs to the planter with wood screws threaded through the bottom of the planter.