DIY concrete curbing around flower bed.
DIY concrete curbing around flower bed.

Adding a concrete curb to your flower garden or foundation bed will help define the space and contain the plants. Here’s how to go about it:

  1. Use a flat shovel to define the outline of the curb and level the ground.
  2. Compact the soil to provide a solid base using a tamp to prevent the soil from settling and cracking the concrete
  3. Install a 4” wide strip of 1/4” hardboard supported by wooden stakes next to planting bed to serve as a form the concrete.
  4. Position 5” long blocks of wood against the inner form.
  5. Install a second hardboard form, supported by stakes, level with the inner form.
  6. Mix up the concrete, adding colorant if desired. We used QUIKRETE concrete and colorant for our curb.
  7. Pour the concrete into the form, using a trowel to smooth it level with the top.
  8. Round off the front edge of the concrete with an edging tool.
  9. Create an indentation in the top of the concrete every 3’ to 4’ with a scoring tool to limit cracking.
  10. Remove form once concrete has set.

Watch this video to find out more.

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13 COMMENTS

  1. I’m planning on doing this in my yard for about 100 feet of curb. Yikes that’s a lot.
    I agree with Seth above that with the screws on the inside it seems difficult to take the forms off. How would you go about doing that?
    Also, I can’t find 1/4″ hardboard anywhere? Is there anything you would recommend that would work as well? Would composite landscape edging work? It seems similar.
    Thanks! Keep up the good work!

  2. If you have crabgrass, wire-grass, or other pesky weeds that travel by runners, consider setting the curb deeper into the ground to stop them. A floating curb won’t stop them from traveling from the lawn side to the garden side. Here in Virginia the wire-grass will crawl under anything less than about 6 inches deep. The result of course is that you need almost a wall, rather than a curb. But the techniques are the same – build a form and pour the concrete. Also, consider reinforcing your concrete with rebar or the addition of reinforcing fibers to prevent falling apart. Cracking will happen, ideally at the control joints you put in just like in a sidewalk. But if the concrete is reinforces, the crack will always be just a crack, and not where the pieces fall apart!

  3. Thanks for the tips. I have been trying to figure out how to pour a concrete curb around my garden for the longest time. Your video was especially helpful. I never knew you could add colorant to the concrete!

  4. Great video! Fortunately, I already have curbing around my garden beds, problem is they’re sinking. What do you recommend for this?

  5. Will the board stick to the concrete when it drys? I’ve never done concrete work before but am not intimidated so play to try this.

  6. Long bits of non-reinforced concrete on merely compacted soil..? It’ll crack into pieces in no time at all. At the very least I’d put in some rebars in the concrete, or physically split it into yard-long blocks to allow movement.

    • Hi, Yemi,
      Thanks for your interest in this episode!
      This article is nine years old, so, unfortunately, we no longer have that information. :\
      Take care!

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