Window boxes allow you to grow flowers, herbs or vegetables in a small space. Add an accent of color to your house with a window box overflowing with flowers. Keep fresh herbs handy to your kitchen with a window box herb garden, or grow salad greens and cherry tomatoes. If you don't have a convenient window, use your window box on a deck or balcony.
Cut the front and back sections of the planter from the 6-foot board. Each section should be 30 inches long. Cut a 30-inch section from the 4-foot board for the bottom of the planter. Cut two pieces, 5 7/8 inches by 6 3/8 inches, for the sides.
At the bottom edge of each side piece, make a mark 5 inches from the back. Draw a line from this mark to the top front edge of the side piece. Cut along this mark. Your side pieces will now have a straight back and a tapered front.
Glue all the pieces together. Clamp and allow to dry. Predrill holes in the front and back sections and use 1 ½ inch screws to secure these pieces to the sides.
Drill holes in the bottom of the box for drainage. Use a 1/8 inch drill bit and drill holes three inches apart.
Paint or stain your window box. Use a paint designed for outdoor use.
Fill the box with a planting mixture and plant with your desired plants.