Edge before you mow, cut about two inches deep, and blow the debris off the hard surface when you are done. That sequence is most of the job. The tool that makes it easy is a wheeled blade edger with a depth stop — the corded WORX 12 A 7.5" Edger is the cheapest way to a genuinely professional edge, and the Greenworks 40V 8" cordless edger is the one to buy if dragging a cord around the whole lawn perimeter is the thing that will stop you doing it.
Two different jobs get called edging and it is worth separating them. Edging is cutting a vertical line where the lawn meets a hard surface or a bed, with a blade, to a set depth. Trimming is cutting the grass the mower could not reach, with line, horizontally. You need both, they happen in the same session, and only one of them produces the crisp line people mean when they say a lawn looks sharp.
We have not edged a lawn for this page. The technique below is the standard sequence and the reasoning behind each step; the tool specs are the blade sizes, amperages and depth controls the listings publish — see how we pick. Prices are live with an “as of” date.
The order of operations, and why it is that order
1. Edge first. Cutting a vertical edge throws soil and severed roots onto the lawn and the path. If you mow afterwards, the mower picks most of that up for you. Edge after mowing and you have made a mess on a lawn you just finished.
2. Trim second.With the hard edge cut, trim the grass the mower deck cannot reach — around posts, against walls, along the bed line you just defined.
3. Mow third. The mower collects the debris from steps one and two and leaves the finish you actually see.
4. Blow last. Clippings and soil on the drive make a sharp edge look scruffy. Thirty seconds with a blower is the difference between a tidy lawn and a finished one. The blower rankings cover which machines move debris rather than just lifting it.
How deep, and how often
| Job | Depth | Frequency | Tool |
|---|
| Cutting a new edge for the first time | About 2 inches | Once, then maintain | Wheeled blade edger, or a spade for short runs |
| Maintaining an existing edge | 1 to 2 inches | Every second or third mow | Wheeled blade edger |
| Tidying an edge between cuts | Surface only | Weekly, with the trimming | Trimmer turned vertically, or a 2-in-1 head |
| Trenching for cable or irrigation | Full blade depth | As needed | Edger in trencher mode |
Depths are the working range these 7.5 and 8 inch blades are built for. Blade sizes, amperages and the presence of a depth stop are published specs; live prices with an “as of” date are above.
Cutting a first edge where there is none
A lawn that has never been edged has grass growing over the path by an inch or two, and the boundary is buried. Find the real line first: the hard surface has a straight edge under there, and you want to cut along it, not along where the grass currently stops.
Run a string line or lay a hose for a curve, then make one slow pass at full depth. Do not try to lift the turf with the edger — cut the line, then come back with a spade or a stiff rake and remove the strip of sod the blade has freed. The first edge is the hard one; every maintenance pass after it is quick.
For curves, a hose gives you a shape your eye accepts. Straight-line edges want a string line, because a human walking freehand drifts and a shallow curve in a line that should be straight is far more obvious than a wobble in a curve.
Technique: four things that matter more than the tool
Let the wheel ride the hard surface. A wheeled edger with its wheel on the path cuts the same depth the whole way. That consistency is the entire reason a professional edge looks professional, and it is a mechanical property rather than a skill.
Walk slower than feels necessary. At speed the blade skips and the line scallops. Slow enough that the blade is cutting continuously costs you a minute on a suburban perimeter.
Do not fight roots. If the blade stalls on a tree root, lift out, shorten the depth, and come back. Forcing a blade through a root damages the tree and the tool.
Cut away from the bed, not into it. On a bed edge, the vertical face belongs on the lawn side so the mulch has something to sit against.
The tools, honestly ranked for this job
A wheeled blade edgeris the right tool and there is no real argument. A steel blade on a wheel with a depth stop cuts a vertical wall; nylon line cannot. Corded if your perimeter is short or near an outlet, cordless if it is long — and edging traces the whole perimeter by definition, which is why cordless is worth more here than on most tools. The full edger rankings go deeper.
A 2-in-1 trimmer with a rotating headis the sensible compromise if you edge twice a year rather than twice a month. It gives a tidy line, not a sharp one, and it also does your weekly trimming — see trimmer-edger combos.
A half-moon edging iron— a hand tool — is genuinely good for short bed edges and costs very little. For a whole perimeter it is a long afternoon.
A string trimmer held sideways works and is what most people do. Accept that it scuffs rather than slices, and that the line will wander; the trimmer vs edger comparison sets out exactly what you are giving up.
Safety, briefly
An edger throws soil, grit and stone chips at speed along a hard surface. Eye protection is not optional, closed shoes are sensible, and check the run for sprinkler heads, low-voltage lighting cable and irrigation line before you cut — a blade at two inches finds all three. Call before you dig if you are trenching rather than edging.
