Key takeaways
- Edging is the five minutes of work that makes the other two hours of mowing look like you hired someone. A clean line between lawn and bed, lawn and walkway, or lawn and driveway reads as “maintained” even if the…
Edging is the five minutes of work that makes the other two hours of mowing look like you hired someone. A clean line between lawn and bed, lawn and walkway, or lawn and driveway reads as “maintained” even if the grass itself is a little rough. Skip it for a season and the grass creeps over every hard edge, and you end up paying for it with a trimmer and twenty minutes of hacking at runners that have rooted into the gravel.
There are really three ways to do this: a manual edger, a gas or electric edger, or a string trimmer held on its side. Which one is “best” depends on how much edge you have and how often you’re willing to do it.
Manual edging: fine for small yards and new beds
A half-moon edger (the stamped steel kind on a long handle) is the simplest tool here. You step on it, rock it forward, pull it out, move over four inches, repeat. For cutting a brand-new edge into an overgrown lawn, this actually works better than any powered tool, because it slices a clean vertical cut through sod and roots instead of chewing at them.
The catch is pace. Edging 100 feet of bed border with a half-moon edger takes 30-45 minutes depending on how compacted the soil is and how much grass has invaded. For a small yard with a few garden beds, that’s a reasonable trade for a $20-30 tool with zero maintenance. For anything longer than a driveway and a couple of beds, your shoulders will vote against doing this every two weeks.
A rotary hand edger (looks like a pizza cutter with teeth) is faster per foot but needs a reasonably straight line to track well — it wanders on curves and around trees.
Powered edgers: worth it once you’re maintaining the line, not cutting a new one
A dedicated edger — gas, corded electric, or battery — has a vertical blade that runs along a guide wheel. It’s built to re-cut an existing edge every week or two, not carve a new trench. Run one on a lawn that hasn’t been edged in months and the blade bogs down or skips over thick grass instead of cutting it; you’ll get a better result doing the first pass with a half-moon edger and switching to the powered tool for maintenance after that.
Battery edgers in the 40-56V range now cut a 300-400 foot property on one charge, which covers most residential lots. Gas edgers have more sustained torque for thick, overgrown St. Augustine or zoysia, but they’re loud, need mixed fuel or a four-stroke tank, and are overkill for a quarter-acre lot with a few flower beds. If you’re shopping, this is a reasonable place to compare cordless lawn edgers against gas models before deciding.
Failure mode to know about: the guide wheel on cheaper edgers wears a groove or goes slightly out of true after a season or two of hitting sidewalk edges, which makes the cut wander side to side. That’s a $150 tool problem more than a $300 tool problem — the pricier models usually have a sturdier wheel assembly and a depth adjustment that actually holds its setting.
Using a string trimmer on edge: works, but it’s a compromise
Most trimmers let you rotate the head 90 degrees and run it vertically along an edge. It’s genuinely fine for touch-ups between real edging sessions, and if you already own a string trimmer, you don’t need to buy anything else for a one-time job.
What it won’t do well is cut a crisp vertical line into soil or sod — the line flexes and tears grass unevenly rather than slicing it, so the edge looks fuzzy instead of sharp, especially right after rain when the ground is soft. It also burns through trimmer line fast when run against dirt and concrete all day. Fine for maintenance between beds, not a real substitute for a blade edger if you want the sharp line look.
Quick comparison
| Method | Best for | Typical cost | Time per 100 ft | Main downside |
|---|---|---|---|---|
| Half-moon manual edger | New edges, small yards, overgrown invasion | $20-35 | 30-45 min | Slow, physically tiring |
| Rotary hand edger | Straight runs, light maintenance | $30-50 | 20-30 min | Struggles on curves |
| Battery/electric edger | Regular maintenance on established edges | $100-250 | 5-10 min | Weak on thick overgrowth |
| Gas edger | Large properties, tough grass types | $150-350 | 5-8 min | Loud, fuel maintenance |
| String trimmer (vertical) | Occasional touch-ups | $0 if owned | 10-15 min | Fuzzy, uneven line |
The technique matters more than the tool
Whatever you use, cut at a slight angle — about 15 degrees off vertical, leaning the blade toward the bed — rather than straight down. This creates a small trench that acts as a barrier against grass runners and gives mulch somewhere to sit without spilling onto the lawn. Cutting straight down looks sharp for a week and then grass roots cross it within a month because there’s no physical gap stopping them.
Depth should be 2-3 inches, no more. Deeper cuts into clay soil just make a trench that collects water and erodes during heavy rain, which means re-edging more often, not less.
What to actually buy
If you’ve got under 50 feet of bed edge and don’t mind a bit of effort every few weeks, skip the powered tool entirely — a half-moon edger does the job and never needs charging, fuel, or a tune-up. Past that, a battery edger covers the vast majority of residential yards without the noise or fuel hassle of gas, and it’s the option most people end up happy with two seasons in. Gas only makes sense if you’re dealing with thick warm-season grass on a lot large enough that battery runtime becomes a real constraint, or you’re doing this for more than one property.
