How to Make Landscaping Border Molds

Measure the total distance you plan to border. Sketch out the total project, and calculate how many concrete border sections you’ll need to create that border, based on your preferred size. In this example, we will make a mold to cast 3-inch-thick concrete border sections that measure 24 inches long and 12 inches tall. When a trench is dug and the finished sections installed, 6 to 8 inches of the border will show above the ground.

Assemble the mold from the 24-inch and 13-inch plywood pieces. Lay the pieces out on your working surface as you would a shadow box picture frame. The inside dimensions of this frame, once secured, will measure 24 inches by 12 inches, the exact size of the concrete border sections.

Secure the square at each corner with two screws, using the power drill. Spray the inside of the mold with lacquer, to make sure the concrete mix won’t stick to the inside of the mold after the border section sets. Also spray one side of the 24-by-12 plywood piece, if you decide to use it to create a smooth finish for the border’s front.

Make multiple molds if you plan to pour more than 10 or 12 border sections, to make the task go more quickly. When you’re ready to pour your landscape border, place the molds on a level bed of construction sand, mix the concrete according to product instructions and pour it into the molds.