Do robot mowers trim edges? Only partly. A mower with a center-mounted blade deck stops short of walls, fences and flower beds, leaving a strip of uncut grass that Robomow puts at about 10 to 20 cm. Edge-cut models narrow that strip, but most yards still need a hand trimmer for the last few centimeters.
The short answer
- Standard mowers: a center-mounted deck leaves an uncut strip along borders.
- Edge-cut models: a dedicated edge disc or offset blade cuts closer to the border.
- Still needed: a string trimmer or shears for stone borders, raised beds and tight spots.
- Setup matters: the boundary wire or virtual zone decides how close the mower gets.
Do robot mowers trim edges on a standard deck
Many owners ask “do robot mowers trim edges” before buying a trimmer. A standard robot mower leaves an uncut strip because its blades sit in the middle of the deck, not at the outer edge. Robomow puts that strip at about 10 to 20 cm when the mower has no edge-cut function.
Yarbo describes the same limit, noting that traditional robot mowers use central cutting decks that keep their blades from reaching grass along fences, flower beds and pavement edges. Ecovacs calls the result “greens creep,” a strip of uncut grass along borders that needs manual trimming. Yarbo’s FAQ adds that most high-end mowers cut within 2 to 3 inches of the edge, while budget models might leave 4 to 6 inches uncut.
Robomow also says its mowers reach their limits where vegetation grows right up to walls and fences, and it recommends leaving a margin of about 6 cm to the outermost edges. For standard decks, do robot mowers trim edges fully? No, not in most yards. Our reading is that the strip is a design limit, not a fault. The grass closest to tall vertical obstacles is the grass a standard mower is least likely to reach.
How edge-cut features work
Husqvarna’s EdgeCut uses a dedicated disc at the rear of the mower, fixed at 45 mm (1.77 in) for an optimal cut. According to Husqvarna’s EdgeCut support article, the feature activates when the mower reaches a physical or virtual boundary, and the mower then makes a sweeping turn so the disc cuts along that boundary. The feature can be turned off in the app. Edge-cut hardware changes the answer: a disc at the rear does trim closer, within the disc’s reach.
Not every boundary triggers it. Stay-out zones drawn with AIM technology do not activate EdgeCut, while stay-out zones made with EPOS technology are treated as virtual boundaries and do. Husqvarna lists these compatible models:
- 305E NERA and 310E NERA
- 405XE NERA and 410XE NERA
- 405VE NERA and 410VE NERA
Compared with the 10 to 20 cm strip Robomow describes for a standard deck, the 45 mm fixed disc position is a much narrower reach. The two figures come from different products, though, so treat the comparison as a rough guide. The model list matters, because edge cutting depends on which EdgeCut model you buy. Husqvarna also advises cleaning the disc guard regularly, especially in spring and fall.
Edge-cut models compared by brand figures
The stated edge distance ranges from a 45 mm fixed disc position at Husqvarna to a 1.97 in blade-to-edge distance at Ecovacs for borders the mower cannot cross. Ecovacs argues that offset blades can cut nearer to the edges than center-located blades, and it describes what it calls zero-edge cutting, where a mower rides along passable borders. The table below lists the figures we read. When you compare brands, the stated figure matters most, and our review of which robot mower has the best edge cut lines up more models.
| Design or model | Stated edge figure | Type of figure | Source |
|---|---|---|---|
| Standard center-blade deck | Uncut strip of about 10 to 20 cm | Brand description | Robomow |
| Robomow edge-cut function | About 6 cm (the page also says about 5 cm) | Brand figure, inconsistent within the page | Robomow |
| Husqvarna EdgeCut | 45 mm (1.77 in) fixed disc position | Product spec | Husqvarna |
| Ecovacs GOAT A2500 RTK | 1.97 in blade-to-edge on unpassable borders | Brand claim | Ecovacs |
| Yarbo Robotic Trimmer | Within 2 to 4 in of fences, walls and hardscapes | Brand claim for an accessory | Yarbo |
Our reading is that the table mixes product specs with marketing claims, which makes it hard to judge how well a mower trims edges in practice. The Robomow figures disagree with each other on one page, so treat the 5 to 6 cm figure as approximate. Before you buy, look for the edge figure in the manual of the exact model, or compare robot mowers with edge trimming side by side.
Where a hand trimmer is still needed
A hand trimmer is still needed wherever the mower cannot reach, such as stone borders, raised beds and grass that grows against walls, even when the answer is yes. Robomow gives a recommended stone border width of about 10 to 24 cm, depending on the model, so check that your border fits the mower you choose. A cordless string trimmer for robot mower edges handles what is left. In practice, robot mowers trim edges well only in the easy spots, and Yarbo also says that most homeowners still need a string trimmer or handheld tool for edges with standard mowers.
- Raised beds and borders the mower cannot cross, where the grass along the border needs a trimmer (see mowing around flower beds for layout tips).
- Grass-sensor models without a perimeter wire, where Robomow says manual trimming with a lawn trimmer is the only option.
- Vegetation that comes right up to walls and fences, where the mower reaches its limits.
Heads up
Robomow says its mowers reach their limits where vegetation comes right up to walls and fences, so keep those edges trimmed back between cuts.
How wire placement affects edge cutting
Wire or virtual boundary placement decides how close the mower gets, and so how closely the mower trims edges up to a border, because a boundary set too close makes the mower bounce off obstacles while one set too far leaves grass uncut. Husqvarna says that when the wire is too close to an obstacle, the mower bounces off it and performs an EdgeCut. When the wire is too far away, more grass stays uncut, and its drive past wire function can reduce that gap.
Robomow notes that in some models the mower can overshoot a wire placed right at the edge by as much as 30 cm. Husqvarna also warns that parallel mowing patterns may leave edges uncut and suggests checkerboard or triangle patterns for better edge coverage. Our reading is that boundary setup is often the cheapest fix, so check it before you decide the mower trims edges poorly. Our guide on how to install a robot mower boundary wire shows the layout step by step.
Frequently asked questions
Do robot mowers trim edges right up to the border?
Usually not completely. A center-blade deck leaves a strip that Robomow puts at about 10 to 20 cm, and edge-cut models narrow it. Check the edge figure for the exact model before you buy, because brands measure differently.
Is an edge-cut feature the same as a trimmer?
No. Husqvarna’s EdgeCut uses a disc fixed at 45 mm and triggers at a boundary, which reduces hand trimming. Robomow and Yarbo both still describe manual edging for some yards, so an edge-cut model lowers the work without removing it. Whether the result is good enough to skip the trimmer depends on your borders.
Do robot mowers trim edges better without a wire?
Not automatically. Ecovacs says its TruEdge system uses 3D-ToF and AI cameras to detect the boundary. Husqvarna says EPOS virtual zones trigger EdgeCut, but the placement of the virtual boundary still decides how much grass is left.
How wide should a stone border be for a robot mower?
Robomow gives a recommended stone border width of about 10 to 24 cm, depending on the mower model. Check your model’s manual for the exact figure before you lay out a border, because the recommendation differs by product.
Sources
- How cleanly does a robotic mower cut the lawn edge (Robomow): strip width, 6 cm margin and stone border width, brand figures.
- Can Robot Lawn Mowers Cut Grass Along the Edges? (Ecovacs): offset blades, greens creep and the A2500 RTK distance, brand claims.
- Do robot mowers cut edges? Discover the truth with these 5 insights (Yarbo): central deck limit and trimmer distances, brand claims.
- What is EdgeCut and how do I use it? (Husqvarna): disc position, triggers, compatible models and wire placement.
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