A cordless string trimmer cuts grass and weeds along fences, beds, and hardscape edges where a mower deck cannot reach. For most suburban lawns, a 20V to 40V (or equivalent) battery trimmer with a 12 to 15 inch cut path and bump-feed or auto-feed line handles weekly edging. If you regularly cut thick brush or long neglected edges, step up in voltage and line diameter, or use a brush-cutter blade only if the tool is rated for it and you add heavier PPE.
Corded, cordless, and gas - quick compare
| Type | Strength | Tradeoff |
|---|---|---|
| Cordless | No cord, quick start, low maintenance | Runtime limited by battery |
| Corded electric | Steady power, lighter tool body | Cord management near edges |
| Gas | Long runtime, brush power | Fuel, exhaust, more service |
Most home lawns do fine on cordless. Keep a second battery on the charger so edging and a blower or hedge tool can share a platform.
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Find My Plants →Safety (read before you pull the trigger)
String trimmers throw stones, wire bits, and wood chips at high speed. This is not a soft toy tool.
- Wear safety glasses or a face shield every time - eye injuries are common.
- Wear long pants and closed shoes; consider shin protection when cutting against gravel.
- Keep bystanders and pets at least 50 feet away from the cutting path.
- Never trim near people, windows at close range, or parked cars without checking for gravel.
- Remove the battery before clearing wrapped line or opening the head.
- Do not blade-convert a string head unless the manual allows it; blades raise the injury risk sharply.
- Watch for hidden hazards: landscape lighting wires, irrigation heads, low fencing, and scrap metal in tall weeds.
- On slopes, keep a stable stance; do not overreach from ladders or retaining walls.
If vegetation hides debris you cannot see, walk the line first and pick up rocks and wire by hand.
Checklist for clean edges
- Charge batteries fully; cold weather cuts runtime.
- Fit the line diameter the head is rated for - oversized line stalls motors.
- Set the guard in place; never run without it.
- Edge slowly along hardscape with the motor at speed before contact.
- Angle slightly away from siding and fence boards to reduce scuff marks.
- Sweep or blow clippings off walks when finished.
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Edging technique
For a crisp walkway edge, walk slowly with the trimmer head vertical (if your model supports edging mode) or at a slight angle, letting the tip cut rather than forcing the whole head into concrete. Along beds, cut weeds at the soil line without scalping desirable ground covers. Against chain-link, go slower - fence wire eats line quickly.
Pairing tools
Mow first, then trim. Use a leaf blower to clear clippings from beds and walks. For shrub faces, a cordless hedge trimmer is the better tool - do not try to shape hedges with string. Hand cleanup in beds is easier on a garden kneeler.
Maintenance
Keep vents clean. Replace worn spools before the line welds inside the head from heat. Store batteries indoors above freezing. Check the guard screws after rough work against fences. Wipe sap and grass off the shaft so clamps and adjusters keep moving.
Bottom line
Pick a cordless string trimmer in the mid-voltage home range for weekly lawn edges, wear real eye protection every session, and keep people and pets far from the debris path. Match line size to the head, and walk debris-prone edges before you cut.
Related reading
- Leaf blowers for yard clearing
- Garden kneeler and seat for bed work
- How to overseed a cool-season lawn
- Fall grub control for cool-season lawns
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