A window box allows you to add a burst of color in the form of flowers and greenery to the front of your home. Depending on your woodworking skills and the time you have, you can make a planter box that is as lovely and elaborate as the plants inside it. Use a wood that can withstand the rigors of the outdoors without rotting, such as cedar.
You can complete the window box planter within an afternoon, giving you plenty of time to head to the nursery for some plants to fill the box with. You'll need a measuring tape, 3/4-inch thick wood boards, a saw, a drill and screws for this project. You can paint or stain the box using a waterproof paint or deck stain. You'll also need a few 2-inch thick wood boards for the brackets.
Cut the 3/4-inch thick wood boards into five pieces. Two pieces should measure the length of the box by its height, two pieces should measure the width of the box by its height and the final piece should measure the length by the width of the box for the bottom of the window planter. Cut the 2-inch boards into three 6-inch high pieces.
Attach the front and backboards to the bottom board with the screws and your drill. Attach to the sidepieces to the bottom of the planter. Secure the sidepieces to the front and back with screws. Paint or stain the box and the 3 brackets
Drill several countersunk holes into the front edge of the 2-inch thick boards, then use deck screws to attach to the wall just under the window. Place one board in the middle of the window and one on each end. Drill a few holes into the bottom board of the planter for drainage. Set the box on the three brackets, fill with potting mix and your plants.