Wood planter boxes make a picturesque, natural backdrop for summer flowers, grasses and vegetables. Being able to make your own planters in exactly the size and shape you prefer allows you to maximize your container garden and create a consistent style for your patio or porch.
Measure and cut two 2-by-4 redwood boards 2 inches less than your desired length. Use a sanding block and wood file to smooth the ends of the boards.
Measure and cut a 1-by-12 inch redwood board 2 inches less than your desired length. Cut the board using a table saw. Smooth the ends of the boards with a sanding block and wood file.
Align each of the 2-by-4 inch boards to the outside of the 1-by-12 inch board. Screw through the 1-by-12 inch board into the 2-by-4 inch board. Use at least six screws per 2-by-4.
Drill a drain hole in the center of the board using a 1-inch hole saw.
Cut two pieces of 1-by-12 inch redwood board at 12-inches long. Place one piece next to the end of your planter box bottom and use it to elevate the side piece off the ground 1 inch. Align the second piece with the end of the planter box bottom. Drill pilot holes through the 1-by-12 inch side piece into the end of the 1-by-12 inch planter box bottom board. Screw the side of the planter box onto the bottom. Use at least three screws.
Use a piece of 1-by-12 inch scrap to elevate the second side and attach it to the planter box bottom the same way.
Measure from the outside edge of one side to the outside edge of the other side and cut two pieces of 1-by-12 inch redwood to this measurement. Use a piece of 1-by-12 inch scrap to elevate the long side so that it aligns with the already screwed sides and bottom. Drill pilot holes through the long side into the ends of the screwed sides and planter bottom. Screw deck screws through the pilot holes, using at least three screws per section. Repeat on the last side. You should now have an elevated redwood box with a drain hole in the center of the bottom.
Cut two redwood 1-by-3 inch redwood trim boards 1 1/2 inch longer than your planter box. Cut two redwood trim boards 7 1/2 inches long.
Apply a bead of silicone adhesive and butt the end of the 7 1/2-inch board against the side of the longer board. Drill two pilot holes and screw two long deck screws joining the butt joint together. Repeat on all four corners. Wipe off any excess glue with a moist rag.
Position the top frame over the top of the planter box so that it overhangs the box evenly on all sides. Drill pilot holes through the top frame into the ends of the planter box sides. Screw deck screws through the pilot holes; use at least three screws per section.