You can make your own planter boxes if you have basic carpentry skills and tools. With two end boards of equal size and two side boards of equal size, you can build a frame for your planter. Finish with a a bottom piece, and the project is complete. A planter box can also be made with just the frame, set on gravel or even the bare ground. Fill it with rich soil, and you are ready to plant vegetables, flowers or any other plants you desire.
Cut your lumber. Make two pieces 2 feet in length and two pieces 4 feet long.
Use galvanized screws to attach the two longer pieces, which are the sides of the planter, to the shorter pieces, which are the ends. Use three screws to make each corner.
Place the wood frame on top of a piece of plywood. Mark around the frame to get an exact fit for the bottom of the planter box. Cut the plywood along the markings.
Turn the frame upside down and place the plywood bottom on top. Screw the bottom to the frame, along the edges of the plywood piece. Use four screws along each long side, evenly spaced. Use three screws along the ends, evenly spaced.
Use a drill to put several holes into the bottom of the planter box for water drainage.
Paint an outdoor sealer onto the inside and outside of your planter box. This can be purchased at your local home improvement center. If you are going to plant vegetables in your planter box, be sure to buy an organic sealant. Let the planter box sit for 24 hours before filling it with soil and plants.