If you want a yard border that looks crisp, modern, and surprisingly expensive without spending a fortune, this little cement project is such a satisfying one. The idea is simple: use plastic magazine holders as angled molds, fill them with wet cement, and turn out sturdy border pieces that sit neatly along a garden bed, walkway, or patio edge. I love projects like this because they give that clean landscaped look without requiring a big weekend build.
As someone who is usually squeezing DIY time in between work and figuring out dinner, I really appreciate outdoor projects that use a short materials list and don’t need fancy carpentry skills. This one is great for beginners, especially if you like practical upgrades that make your yard look more finished. The end result has a sleek slanted shape that feels a lot more custom than the materials would suggest.
Materials
6 plastic magazine holders, standard size about 10 1/4 inches tall x 3 3/4 inches wide x 10 inches deep
Instructions
1. Clean and dry the plastic magazine holders, then inspect them for holes or open seams that might leak once filled.
2. Tape over every seam, opening, and edge you do not want cement to escape from, pressing the duct tape down firmly both inside and outside the holders.
3. Lightly coat the inside of each holder with cooking spray or a thin film of vegetable oil so the cured cement releases more easily later.
4. Set each holder on a piece of cardboard with the slanted side positioned the way you want the finished border to lean, then brace them so they sit steady and do not tip.
5. Mix the concrete in a tub according to the package directions until it reaches a thick, scoopable consistency similar to stiff oatmeal.
6. Scoop the wet concrete into the prepared magazine holders a few inches at a time, tapping each mold against the ground after every few scoops to release trapped air.
7. If you want a slightly rougher, heavier border, stir a small handful of pea gravel into the center of each mold as you fill it, then cover it with more concrete.
8. Smooth the top surface with a scrap stick or putty knife, then tap the sides again to settle the mix and level out any gaps.
9. Let the concrete cure undisturbed for at least 24 hours, or longer if the weather is cool or humid, until each piece feels solid and fully set.
10. Peel away the tape, gently flex the plastic holder, and slide out each concrete border piece without forcing it.
11. Place the finished border pieces along your garden or walkway with the angled face oriented consistently, pressing them slightly into the soil for stability.
12. Backfill soil or mulch around the base of each piece so the line looks clean and the borders stay locked in place.
Variations & Tips
Make a longer run: Buy identical magazine holders so every border piece matches exactly; mixed shapes can look uneven once installed side by side.
Use quick weekend timing: Fast-setting concrete is easiest if you are fitting this project into a busy schedule, but still give the pieces a full cure before rough handling.
Get cleaner edges: Tapping the molds well during filling makes a huge difference. The first time I worked with small concrete molds, I skipped that part and ended up with more air holes than I wanted.
Adjust the finish: For a smoother look, lightly sand any rough spots after curing. For a more rustic garden edge, leave the natural texture as is.
Secure them in loose soil: If your border is going into soft mulch or sandy ground, dig a shallow trench first so each piece sits partially buried and stays aligned.
Protect your molds: Plastic magazine holders can sometimes be reused once or twice if you remove the concrete carefully, so it is worth taping neatly and using a little mold release.