Best Robot Mower That Cuts Close to Edges: 4 Key Factors

8 min read by Megan Hartley Updated November 11, 2026

The best robot mower that cuts close to edges depends on its blade layout and how accurately you lay the boundary wire. As of 2026-11-10, manufacturer guidance shows that a centered blade leaves a strip of uncut grass along the border, and that an off-center or edge-cut design narrows it.

The short answer

Blade layout: an off-center disc or a dedicated edge disc reaches closer to the border than a centered blade.
Wire placement: the boundary wire sets how far the mower goes, so a wire set too far inward leaves more grass uncut.
Typical strip: Robomow puts the uncut strip at about 10 to 20 cm for centered blades and about 5 to 6 cm for its edge-cutting models.
Our reading: check the edge method on the spec sheet, then the wire distance in the installation guide, before you buy.

How the best robot mower that cuts close to edges reaches the border

A robot mower with a centered blade leaves an uncut strip beside the border, and Robomow puts that strip at about 10 to 20 cm for centered blades. The blade sits under the housing for safety, which leaves a gap between the blade and the housing. That gap is most noticeable when the mower drives along a wall.

ECOVACS, another manufacturer, describes the same gap and calls the uncut band “greens creep.” It also notes that with a boundary wire, the wire’s placement often makes the mower stop short of fences and walls. Both are vendor descriptions, so treat them as the manufacturers’ view rather than independent measurement.

Edge-cutting designs narrow the gap in different ways. Husqvarna’s EdgeCut feature uses a dedicated edge disc at the rear of the mower, fixed at 45 mm (1.77 inches). When the mower nears a boundary, it makes a sweeping turn so the disc cuts along the edge. EdgeCut is listed only on certain Husqvarna NERA Automower models, so check the model list before you assume it is included.

Worx takes a different route. Its models with an off-centered blade disc give a close cut along borders, while models with a standard disc rely on a border-cutting schedule to cut down on manual trimming. Robomow’s edge-cutting models narrow the strip to roughly 5 to 6 cm by its own figures, which is still not zero.

Why the boundary wire decides the result

The boundary wire sets the limit the mower will reach, so its placement matters as much as the blade design when you shop for the best robot mower that cuts close to edges. Husqvarna says that “a precise installation is key for optimal edge cutting,” and a wire laid too far inward leaves grass that the blade cannot reach.

Green boundary wire, metal pegs, a brush, a screwdriver and a small metal tray laid out on a wooden bench — Boundary wire and pegs set the limit the mower will reach.

A wire laid too close causes the opposite problem. Husqvarna explains that when the wire sits closer to obstacles than recommended, the mower bounces off the obstacle and performs an EdgeCut. Robomow adds that a wire laid right at the edge can let some models travel up to 30 cm beyond it, so placement cuts both ways. Husqvarna’s EdgeCut page does not give one fixed distance, so the installation guide for your model is the reference. If you lay the wire yourself, our guide to the best robot mower wire pegs covers what holds it in place.

For Automower models with AIM Technology, Husqvarna’s AIM guidance recommends setting the work area border at least 1.5 m (5 feet) outside the lawn. AIM accuracy is about 1 m (3.3 feet), and a border set close to the wire can make the mower stop short of it and leave a strip uncut. Our wired vs wireless robot mower comparison shows how each setup affects the edge.

Paths, flower beds and walls limit how close the mower gets

Edge cutting reaches the border most easily where the mower can roll over it, such as a level path. Robomow advises placing the wire close to a path that forms the outer edge, and paths the mower drives over do not need a wire at all.

Obstacles the mower cannot drive over need more clearance. Robomow says to keep a larger distance from flower beds, walls and water, because a wire placed too close can make the mower slip and get stuck. For centered-blade models, edging stones 10 to 24 cm (4 to 9.5 inches) wide, laid in two staggered rows, let one wheel ride over them while the blade still reaches the grass.

Three-wheel models need one more check: the front wheel must not extend beyond the boundary. Our reading is that the strip beside a raised bed, a wall or a pond will usually stay uncut, so plan to trim those spots by hand. Clearing and levelling the border before installation helps, and our guide on how to prepare your yard for a robot mower lists the steps. For the best robot mower that cuts close to edges, the yard layout matters as much as the model.

Mowing pattern and upkeep change the edge result

Alternating mowing directions gives better edge results, because Husqvarna says parallel patterns may leave edges uncut. Checkerboard or triangle patterns cover an edge from several angles. Our guide to mowing patterns on a robot mower explains how direction changes affect the lawn.

Brush, spare wheel, cleaning cloth, spray bottle and maintenance checklist on a wooden table — A brush and cloth help keep the cutting area and disc guard clean.

On slopes, Husqvarna advises mowing straight up the slope or at about 45 degrees to it. A checkerboard pattern can make the mower cross the slope from side to side, which may wear the lawn or cause slipping. If problems continue, use one-direction mowing or a separate random-pattern zone for the slope. Husqvarna also says that zones made with AIM Technology do not trigger EdgeCut, while EPOS virtual boundaries do.

Disc guard: grass clogs it in spring and wet leaves do in autumn, so clean it regularly.
Cleaning: turn the mower off, brush away grass or rinse with a hose, and do not use a pressure washer. Our best robot mower cleaning brush guide covers a safe tool.
Blades and grip: sharp blades, a pendulum-mounted deck and good-traction wheels help produce a cleaner cut, according to Robomow.

What to check before you buy

Before you buy the best robot mower that cuts close to edges, confirm how the model handles edges, then check the wire guidance and the upkeep. A label such as “edge cut” can describe several different designs, so look for the disc layout on the manufacturer page rather than relying on the name alone.

Edge method: centered blade, off-center disc or dedicated edge disc. The manufacturer page should say which one a model uses.
Model range: EdgeCut applies only to the listed Husqvarna NERA models, so confirm your exact model.
Islands: Worx’s Cut to Edge feature does not mow the borders of islands in the lawn.
Border schedule: Worx says its perimeter cutting runs on a preset schedule, twice a week.
Your obstacles: flower beds, walls and water need more wire clearance, and the strip there may still need hand trimming.
Setup margin: Robomow suggests planning a margin of about 6 cm from the outermost edges to reduce manual trimming.

If your yard has a level path along the border and few raised beds, an edge-cut design is worth a closer look, and that is where the best robot mower that cuts close to edges earns its name. If it is full of beds, walls and water, expect some hand trimming whichever model you choose, and weigh the other criteria in this guide before you decide.

Frequently asked questions

Does a robot mower cut all the way to the edge?

Not completely. Robomow says a centered-blade mower leaves a strip of about 10 to 20 cm, and its edge-cutting models narrow it to roughly 5 to 6 cm by its own figures. Walls and raised beds still need trimming, and the wire placement decides how much of that strip the blade can reach.

What is Husqvarna EdgeCut?

EdgeCut is a feature on selected Husqvarna NERA Automower models. It uses a dedicated edge disc at the rear, fixed at 45 mm (1.77 inches), and makes a sweeping turn when the mower nears a boundary. You can turn it off in the app.

Why does my robot mower leave a strip along the border?

The usual causes are a centered blade, a boundary wire placed too far inward, or a parallel mowing pattern. Husqvarna says parallel patterns may leave edges uncut and that a wire farther away leaves more grass uncut. Alternating directions and checking the wire position are the first things to try.

Can edge cutting replace a trimmer?

Not entirely. Worx’s Cut to Edge feature skips island borders, and both Husqvarna and Robomow describe strips beside obstacles that the mower cannot reach. Our reading is that hand trimming stays useful around beds, walls and water, even with an edge-cut model.

Sources

What is EdgeCut and how do I use it? (Husqvarna): EdgeCut disc offset, sweeping turn, model list, wire distance and pattern advice, AIM and EPOS zones.
How cleanly does a robotic mower cut the lawn edge (Robomow): uncut strip widths, wire placement, edging stones, margin and blade advice.
Can Robot Lawn Mowers Cut Grass Along the Edges? (ECOVACS): why a centered blade leaves a strip, the wire-placement effect near walls. Vendor figures not used.
Cut to Edge and Border Management (Worx): off-centered blade disc, twice-weekly border cutting, island exclusion.
AIM Technology: preventing uncut grass along boundary wire (Husqvarna): work area border distance and AIM accuracy.