Best Trimmer Line for Edging
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The short answer
For edging along concrete use 0.095 in square or twisted line in a copolymer or nylon blend. Square edges bite the turf lip instead of tearing it, and the thicker diameter survives dragging on the sidewalk. Round line is only better for open trimming, where it lasts longer but leaves a ragged border.
Oregon Gatorline Square Trimmer Line
Square copolymer profile that slices the turf lip instead of tearing it — the default 0.095 in edging line.
Edging with a string trimmer is a different job than trimming. The line is running vertically, touching concrete every few seconds, and it needs a sharp profile to slice the grass lip instead of whipping it. That is why line shape matters more than brand.
Line shape, ranked for edging
| Shape | Edge quality | Wear on concrete | Best for | Price |
|---|---|---|---|---|
| Square | Cleanest cut line | Moderate | Crisp sidewalk and driveway borders | Check Price (opens in a new tab) |
| Twisted | Very clean, quieter | Moderate | Long runs where noise matters | Check Price (opens in a new tab) |
| Star / multi-sided | Clean | Fast wear | Thick, overgrown lips | — |
| Round | Ragged, tears blades | Slowest wear | Open trimming, fences | — |
Pick the diameter by trimmer power
- 0.065 – 0.080 in: small battery trimmers under 40V. Use only on light, weekly edges.
- 0.095 in: the edging sweet spot for most 40V–80V and small gas units.
- 0.105 – 0.130 in: gas and commercial heads only — heavier line stalls an underpowered motor.
- Never exceed the diameter on the trimmer head label; oversized line overheats the spool and welds the coils together.
Material matters more on hot days
Basic nylon goes brittle in storage and shatters against concrete. A copolymer or reinforced core line stays flexible and gives you two to three times the run on a hard edge, which is worth the extra few dollars per spool.
Technique that doubles line life
- 1Rotate the head 90 degrees so the line runs in the same plane as the concrete seam.
- 2Cut with the very tip of the line — the last half inch does the work.
- 3Walk backwards so debris throws away from you and you can see the cut line.
- 4Keep the guard on; it trims the line to the correct length automatically.
- 5Do a second light pass to knock down the fringe instead of forcing one deep pass.
Myth
Thicker line always cuts better.
The Fact
Line that is too thick for the motor slows the tip speed, and tip speed is what actually cuts. An underpowered trimmer with 0.130 in line pushes grass over instead of slicing it.
Frequently Asked Questions
- What size trimmer line is best for edging?
- 0.095 in for most battery and homeowner gas trimmers. Step down to 0.080 in on small 20V–40V units and up to 0.105 in only on gas trimmers rated for it.
- Is square or round trimmer line better for edging?
- Square. The corners slice the grass lip and leave a defined border, while round line tears the blade tips and browns the edge within a day.
- Why does my trimmer line keep breaking on concrete?
- You are feeding too much line and burying the tip against the slab. Shorten the line to the guard cutter, keep only the tip in contact, and switch to a copolymer line that resists abrasion.
The Gear We’d Buy
Everything referenced in this guide, in one place.
Oregon Gatorline Square Trimmer Line
Top pickSquare copolymer profile that slices the turf lip instead of tearing it — the default 0.095 in edging line.
Typically $20 - $35
Husqvarna Titanium Force Twisted Line
Quieter twisted profile with a tough shell — good for long driveway runs.
Typically $18 - $30
Universal Bump Feed Trimmer Head
Replaces a worn head that keeps welding line — cheaper than fighting a jammed spool all season.
Typically $18 - $30
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Key Takeaways
- Square or twisted 0.095 in line is the default for edging.
- Match diameter to the trimmer head label, never above it.
- Copolymer line survives concrete far longer than plain nylon.
- Cut with the tip only and walk backwards for a clean line.
Reviewed by
The Lawn Tool Hub Test Bench
We buy, borrow and break lawn tools on our own yards — clay in the back, sand-cut Bermuda in the front — and write down what actually changed the result.
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Top pick
Oregon Gatorline Square Trimmer Line