How to Build a Concrete Mow Strip

Dig a 6 to 8 inch-deep trench where you plan to install the concrete lawn edging, using a shovel. Make the trench slightly wider than 6 inches.

Create walls to make the form for the concrete mow strip using flexible bender board strips that are at least 6 inches wide. Set the bender board so its top is at grade level, and keep the two strips of bender board parallel to each other in the shape that you want the concrete mow strip to take. Place stakes outside the walls of the form to hold them upright, especially on curved areas. Nail the bender board to the stakes for additional support.

Keep the width of the concrete mow strip stable and parallel by placing 6-inch blocks of scrap lumber between the bender board walls. Place the blocks 18 to 24 inches apart.

Mix concrete mix according to the directions on the package. Place the mix in the trench, using a shovel. Pack the concrete firmly into the bender board form. Smooth the top with a hand float tool. Use a finishing tool to create a nice edge and to make it easier to remove the bender board once the concrete sets.

Press the narrow edge of the hand float into the concrete when it stiffens to create the appearance of the junctions between two blocks of concrete. Try to keep the distance between junctions uniform.

Pull away the bender board forms. Allow the concrete to cure for at least 48 hours. Place fill dirt along the outside edge of the concrete mow strip. Smooth it with a rake. Sow some grass seed on the lawn side of the mower strip, and water it.