How to Make Geometric Planter Boxes for Your Patio

Adding planters to a plain patio or deck adds interest and life and makes your outdoor space an extension of your home. Cedar fence pickets from the home improvement store can be transformed into a 15-inch-square geometric planter, perfect next to a seating area and layering with other planters. You will need a good understanding of woodworking, but if you're comfortable using a miter saw, this project can easily be done in a weekend.

6-foot cedar fence picket (three and a half per planter) 

Miter saw 

Pocket hole tool

 1-inch screws 

Clamp 

Drill

Air stapler

Tape measure 

Orbital sander 

Waterproofing sealant 

Safety goggles

Hearing protection

Dust mask

Using a chop saw, cut 11 inch sections (qty 18 per planter) and 5 inch section (qty eight per planter).

Pocket holes are drilled at an angle and allow you to join the wood from the interior so that the screw is hidden.

Below are the measurements for the pocket hole placement for the square and the "T" shape, which will become the triangle.

Drill the pocket holes for the square 3 inches from the sides on five of the 11-inch sections.

Drill the pocket holes for the "T" shape. Mark the center of eight of the 11-inch sections and all of the 5-inch sections and 1 inch from the center of the 11-inch sections. Center the 5-inch section on the 11-inch section.

Insert screws to connect the cedar fence pickets.

For the square, set the bevel of the chop saw to 27.5 degrees and the miter angle to 0 degrees. Cut all four edges to create 10 3/4-inch squares.

For the triangle, leave the bevel of the chop saw at 27.5 degrees and the miter angle at 0 degrees. Cut the 11-inch edge (the top of the "T" shape). Next, set the miter angle on the saw to 30 degrees. With the top of the "T" shape against the saw fence, make the first cut from the corner toward the bottom of the "T" shape. Rotate the triangle so the last cut edge is now against the fence, and cut the third side at 10 3/4 inches. This will leave you with an equilateral triangle with three 10 3/4-inch sides.

After the cuts are made, the pieces will look like this. You will need five squares and eight triangles per planter.

Prepare the pieces to be assembled. Sand the four corners on the squares at approximately a 45-degree angle. Because the square panels meet at the corners to create a 90-degree angle, the angle on the cut edge needs to be sanded to at least a 45 degree angle (this doesn't need to be exact but at least a 45). The corners on the triangle do not need to sanded.

Assemble the planter with an air stapler using the following sequence. First, staple four triangle sections to the edges of a square to form the base. Second, staple four squares to the triangle sections from the base. Third, staple the top four triangles to complete the planter.

If desired, flip the planter, and staple 2-inch squares (inset about 2 inches from edge) from the remaining cedar picket to serve as feet for the planter.

Drill four 1/2-inch holes (this size doesn't need to be exact) to allow water to drain from the planter.

Cedar naturally weathers well, but for added protection, apply waterproofing sealer to protect the cedar.

Let the sealer dry per the product's directions, and then fill it with your favorite flowers. Each planter will take about 1/2 yard of potting soil.