Caleb MorganBy Caleb Morgan

Updated November 2026

To cut plastic landscape edging, measure and mark the cut line, support both sides of the strip, and cut straight through with a fine-tooth saw, utility knife or rotary tool. Done right, you get square ends that seat tightly against each other and leave no gaps for grass to creep through. The whole job takes a few minutes per piece once you have a method you trust.

Measure and Mark Before You Cut

Lay the edging in its final position before you cut anything. Check the run against the bed line, then mark the cut with a permanent marker or a pencil. Wrap a strip of painter’s tape around the edging at the mark, which keeps the blade on track and makes a straight line easier to follow.

Shopping for one? See our guide: Black Plastic Landscape Edging: 5 Best Picks for Clean Lines (2026).

Leave the edging about a quarter inch longer than your measurement if you plan to fine-tune the fit with a file or sandpaper. You can always remove material later, but you cannot add it back.

Choose the Right Cutting Tool

The tool you pick depends on the thickness and flexibility of the plastic. Thin, flexible strips handle a utility knife well. Thicker, rigid profiles go faster with a fine-tooth handsaw or a hacksaw with a blade set for plastic.

  • Utility knife: Best for thin, flexible edging. Score the line several times rather than trying to cut through in one pass.
  • Fine-tooth handsaw or hacksaw: Best for rigid, thick profiles. A blade with 18 to 24 teeth per inch gives a cleaner edge than a coarse blade.
  • Rotary tool with a cutoff disc: Fast and precise, but it melts plastic if you run it too hot. Keep the disc moving and ease off if you smell or see melting.
  • Miter box: Useful for getting a true 90-degree cut when you need square ends.

Step-by-Step Cutting Method

  1. Support the edging on both sides of the cut line. A piece hanging over a block or the edge of a board will crack or pinch the blade.
  2. Start the cut with light pressure to set the line, then work through the full thickness.
  3. Keep the blade or disc perpendicular to the strip so the end comes out square.
  4. Deburr the cut edge with a file, sandpaper or a utility knife blade so the pieces fit flush.
  5. Dry-fit the cut piece against its neighbor before you install it.

Cutting Curves and Irregular Shapes

For curved beds, cut the strip into short straight sections first, then bend each piece into place. For a tight radius, make shallow relief cuts on the inside of the bend. Heat from a heat gun can soften rigid plastic enough to bend it, but work slowly and test on a scrap piece first.

Common Mistakes to Avoid

  • Cutting without support, which causes cracks and uneven ends.
  • Using a coarse blade, which tears the plastic instead of slicing it.
  • Forcing the cut with too much pressure, which can pull the blade off line.
  • Skipping the deburr step, which leaves sharp edges and gaps between sections.
  • Cutting more than you need before a dry fit, which wastes material.
  • Fine-tooth hacksaw blade: Cuts rigid plastic cleanly without tearing the edge. View on Amazon
  • Miter box and backsaw: Gives square, repeatable cuts when you need consistent ends across several pieces. View on Amazon
  • Heavy-duty utility knife: Handles thin, flexible edging and quick scoring cuts. View on Amazon

If you are still choosing a product, our guide to Heavy Duty Plastic Landscape Edging: How to Choose and Install It Right covers thickness and profile options that affect how easy the edging is to cut. For a common residential size, 8 Inch Plastic Landscape Edging: How to Install It for Clean Lines walks through installation after cutting. Owners sometimes ask whether Do You Need Stakes for Landscape Edging? How to Set Them Right matters for fit, and it does, since stakes hold the cut ends in alignment.

FAQ

Can I cut plastic landscape edging with regular scissors?

Thin, flexible edging sometimes cuts with heavy-duty shears, but thicker profiles usually crack or pinch. A saw or utility knife gives a cleaner result on most products.

Will cutting plastic edging make it brittle?

Cutting itself does not weaken the plastic, but very cold weather can make rigid profiles more likely to crack. Work on a mild day when possible.

What is the cleanest way to join two cut pieces?

Cut both ends square, deburr them, and butt them together with a connector or stake placed close to the joint. A tight, square joint keeps the line looking seamless.

Conclusion

Marking carefully, supporting the strip and using a tool matched to the plastic’s thickness will give you clean, square cuts. Deburr each end and dry-fit before installation. With these habits, your edging will sit tight and keep your lawn lines sharp.

Ready to choose one?

Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our lawn edging & trimming guides, checking product details against manufacturer specifications and owner feedback.