How to Build Patio Planters

Measure the particular spot on the patio intended for the planter to decide its dimensions. Keep it up to 3 feet in width and no taller than 9 to 10 inches. Install a wooden block under each corner to raise it if you have back problems.

Place the wooden board on a flat surface before cutting it into five lengths for the rectangular planter. The front and back pieces are identical in length, width and height, as are the short sides or ends. The base is as wide as the end pieces and equals in length to the front and back. Sand the edges of all five pieces so they are smooth.

Lay the baseboard on the flat surface and position the long edge of the front board against its lower long edge until the forming joint is flush and even. Press the front into the edge of the base before drilling a row of wood screws to hold the pieces together. Space the screws 4 inches apart.

Repeat the procedure to attach the planter's back (second long board) to the adjacent long edge of the base the same way.

Hold an end piece in a corner of the forming planter. Align it so its sides press against the edges of the front and back and its base rests against the lower edge of the baseboard. Drill wood screws into its three sides to hold it in place. Repeat the procedure to attach the second end board to the adjacent corner of the planter to complete its assembly.

Turn the planter box over so its base faces upward. Drill ½- to ¾-inch wide drainage holes randomly over it to provide an outlet for excess irrigated or rainwater. Install the blocks, if any, at this point. Secure each block to a corner of the base to raise the planter off the ground and prevent you from bending too low while gardening.

Spray paint the inner and outer sides of the planter with exterior-grade primer-sealer to prevent decay due to natural elements it will be exposed to outdoors. Also, cut plastic liner to size and spread over its base. Punch drainage holes into it as well.