Robot Lawn Mowers: Wired vs Wireless, Splitting a Garden into Zones, and Maintenance

The right question isn't "which robot mower", it's "which one fits your garden"

Most buying guides start with a ranking of the best models. The problem is a robot mower isn't chosen by brand or reviews — it's chosen by the shape, slope and square footage of the specific garden it has to cut. A model praised by the trade press can be completely wrong for an L-shaped garden with a 30% grade, and a budget model can be perfect for a regular 4,000 sq ft lawn.

This piece starts with the real technical differences (wired, wireless, zero-install), moves through the math of splitting a garden into zones when it's bigger than a single mower can cover, and ends with maintenance — with a different angle from the usual roundup, including why you actually need a storage garage if you don't want to strip the whole thing down every winter.

Wired, wireless, or zero-install: the three real options

A wired robot mower is still the most common and cheapest option for a given coverage: a cable, buried or pinned to the ground, marks out the work area and the zones to exclude (beds, ponds, trees). Setup takes longer — half a day for an average garden — but once it's down it's reliable even in tricky conditions (weak GPS under thick tree cover, narrow gardens boxed in by walls).

GPS-RTK wireless mowers (Segway Navimow, some Worx Landroid Vision models) map the garden using a fixed reference antenna and satellites, with no cable to bury. Setup is faster, but the signal can lose precision under dense canopy or near tall walls — a detail plenty of online guides skip, and worth checking before going this route for a garden with lots of trees.

There's a third option almost no article clearly separates from the second: zero-install models like the Ambrogio L60, which use neither wire nor satellite triangulation — they read the grass with a dedicated sensor and simply stay within the lawn's edge, no wire, no antenna, no setup phase at all. You just set it down and it starts. In the technical catalogue both cable-free approaches get lumped under "wireless", but in practice they're two different technologies with different limits on irregular or very large gardens.

What actually matters for installing one in your garden

Before brand or price, three numbers matter more than anything else. The first is maximum slope handled by the model: in the catalogue we track, that runs from 25% on entry-level models up to 50% on the Navimow and Ambrogio L60 flagships — a garden with even one section over 30% automatically rules out half the available models, regardless of budget.

The second is the width of narrow passages between parts of the garden (say, between the house and a hedge): a passage under a metre wide can be impractical for models built for regular lawns, while wired mowers handle complex geometry better because the cable explicitly guides the route.

The third, often ignored, is sharp level changes (not average slope, but a step or a raised bed edge): no mower, regardless of navigation tech, clears a vertical drop of more than a few centimetres without a graded transition.

When the garden is bigger than one mower's coverage: the zone math

Every model has a stated maximum coverage in square metres (the catalogue we track runs from 250 to 3,200 m²). When the garden you've drawn exceeds that number, the answer isn't buying two mowers — it's splitting the garden into zones the single mower covers in rotation, each within its coverage limit.

The calculation is simple but almost never walked through with a real example: zones needed = round UP (total square metres ÷ the model's maximum coverage). A 1,000 m² garden with a 400 m² mower (say, an Automower Aspire R4) needs 3 zones of roughly 333 m² each, not 2.5 rounded down — a common mistake that underestimates the actual weekly mowing time required.

Zones are physically separated by a narrow passage or a dedicated section of wire, so the mower finishes one area, moves to the next on an alternating schedule, and returns to base between cycles. More zones mean more total weekly cutting time, so it's always worth checking — before buying — whether a higher-coverage (and pricier) model cuts the zone count enough to pay for itself in less run time.

How SprinklerMap picks the right mower in the material list

When you draw your garden in SprinklerMap's tool and generate the material list, the tool doesn't just suggest the best-selling robot mower for the category: it calculates how many zones each model in the catalogue would need to cover the drawn area, ranks models first by zone count (fewer zones = fewer passes = a better result) and, for models tied on zone count, picks the cheapest one. It's the exact same logic from the section above, just applied automatically to your specific garden instead of a generic case.

The practical difference versus a generic buying guide: coverage here isn't a number read off a spec table and eyeballed against a rough garden size, it's calculated against the actual drawn area, irregular shapes included. Try it directly by opening /?mode=drawing, tracing your garden's outline, and seeing which model — and how many zones — the tool suggests in the material list.

The real catalogue: 15 models, what actually differs between them

The catalogue we keep updated at /en/brands covers five brands with different philosophies: Gardena and Husqvarna lean on reliability and a wide service network with mostly wired models; Worx Landroid and Segway Navimow push GPS-RTK wireless; Ambrogio Robot — the only Italian manufacturer in the group, based in Tuscany — covers both philosophies, from a zero-install model up to the wired Twenty series for large gardens.

The tip almost nobody gives: skip the garage and winter ruins it

If you don't want to fully strip the mower down every autumn and reinstall it every spring — which is what most owners end up not doing consistently — the only sensible alternative is a storage garage positioned over or next to the charging base. It's not a cosmetic accessory: it protects the mower from direct rain, stagnant humidity and temperature swings that degrade the battery and electronics over time far more than normal use does.

The most common garages (Gardena, Husqvarna, and universal models compatible with several brands) install in a few minutes over the existing charging base and don't require moving anything in the setup. The cost — roughly $45-100 — pays for itself against the risk of replacing a control board damaged by winter humidity, which costs several times as much.

If the mower still ends up exposed (no eave, porch or nearby garage), the real alternative is a full seasonal shutdown: deep clean, battery stored at room temperature and charged to about 50%, never left outdoors below freezing.

Routine maintenance: what to check and when

Cleaning the body and clearing grass clippings from the cutting deck should happen weekly in peak season: wet, packed grass is the most common cause of reduced battery runtime, far more than the battery itself simply ageing.

Blades should be checked every 3-4 weeks and replaced (not hand-sharpened — they're cheap, and most models use replaceable blade tips) once the cut looks torn instead of clean, something you can spot by looking at the tips of cut grass blades the next day.

Wheels need clearing of grass wrapped around the axles every 2-3 weeks and, on models with unsealed bushings, greasing at the start and midpoint of the season: excess friction on the drive wheels is a common cause of abnormal battery drain that gets mistaken for an electronics fault.

The perimeter wire (on wired models) should be tested for continuity at the start of the season — many docks/chargers flag a break with a specific error code — because accidental cuts from a strimmer, mower or winter frost on the buried cable are the most frequent cause of early-spring malfunctions, not a fault in the mower itself.

Bump and lift sensors should be cleared of dust and debris during every weekly body clean: they're the mower's core safety feature (it stops if lifted or if it hits a rigid obstacle), and a dirty sensor can delay the response by a few tenths of a second — enough to matter on a slope.

Frequently asked questions about robot mowers

Does a wireless mower work well under thick trees? Generally worse than a wired one: GPS-RTK signal loses precision under dense canopy, while a buried wire has no such limit.

Is it worth paying more for a mower to cut the zone count? Depends on the price gap: if a higher-coverage model costs twice as much but cuts zones from 3 to 1, it's often worth it, because weekly cutting time drops sharply.

Do I really need a garage if the charging base is already IP44-rated? Yes: IP44 protects against splashes, not prolonged direct rain or the stagnant humidity that builds up over winter months.

How often do blades actually need replacing? On average every 4-8 weeks in peak growing season, more often if the lawn has small stones or twigs causing minor impacts.

The short version

Choosing a robot mower starts with your garden's real numbers — slope, narrow passages, actual square footage — not with whatever's top of the rankings this month. If the garden exceeds one model's coverage, splitting it into zones follows precise math, which SprinklerMap calculates automatically alongside the most cost-effective model for that coverage. And once it's chosen and installed, routine maintenance — blades, wheels, wire, sensors — matters more over time than any extra feature paid for at purchase.

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