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In short :
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- Focus on three things: how much power you need, how wide a strip it cuts, and how much upkeep you’ll actually do.
- Under roughly 300 square metres, a corded or battery mower is usually enough.
- Bigger or thick, fast-growing grass makes petrol the practical pick.
- Match the cutting width to your lawn’s shape, and don’t overlook height adjustment, collection, wheels, and storage.
- Battery mowers handle most domestic lawns fine if you get enough runtime and keep the blade sharp.
- Sharpen the blade once or twice a season, or sooner if the grass tips come out ragged and brown.
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Choosing a lawn mower is one of those decisions that looks simple until you’re standing in an aisle staring at a wall of machines that all seem to promise the same thing. The truth is, the right mower depends far less on flashy features and far more on three things: how much power you actually need, how wide a strip the machine cuts, and how much upkeep you’re willing to do over the years. Get those three right and you’ll spend your summers mowing, not wrestling with equipment.
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This guide walks through the practical criteria that separate a mower that suits your garden from one that becomes a weekend chore. I’ll cover power sources, cutting width, cutting height adjustment, grass collection, terrain handling, ease of maintenance, and storage. No brand names, no prices — just the real-world benchmarks that help you decide with confidence.
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Power source: petrol, electric corded, or battery
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The first fork in the road is where the power comes from. Petrol mowers suit large, uneven plots and thick grass, because they deliver sustained torque without a cord or a battery timer. Corded electric mowers are light, quiet, and ideal for small, tidy lawns close to an outdoor socket. Battery mowers sit in the middle: no fumes, no cord, but a runtime that depends on the battery and the load.
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Think about the actual size of your lawn. Under roughly 300 square metres, a corded or battery machine usually does the job comfortably. Beyond that, or if your grass grows fast and thick, petrol becomes the pragmatic choice. A useful test: time how long it takes you to mow with your current method. If you routinely run past 45 minutes, battery runtime anxiety becomes real, and you’ll want either a spare battery or a petrol engine.
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Common pitfall: buying a battery mower for a big lawn and discovering mid-cut that the battery dies with half the garden left. If you go battery, check the stated runtime under load, not the optimistic figure on the box, and budget for a second battery.
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Cutting width: match it to your lawn’s shape
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Cutting width is the swath the mower clears in one pass, usually somewhere between 30 and 55 centimetres for domestic machines. Wider means fewer passes and faster mowing — but also a heavier, bulkier machine that struggles in tight corners and narrow gates.
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Here’s the practical rule I give people: for an open, rectangular lawn, go as wide as your storage and budget allow. For a garden chopped up by flower beds, trees, and a narrow side path, a narrower deck wins because you can actually manoeuvre it. Picture a lawn with a 70-centimetre gate — a 55-centimetre mower barely fits, and you’ll scrape your knuckles every time.
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A concrete example: a reader with a 400-square-metre lawn and three fruit trees found a wide mower cut the open area fast but couldn’t get between the trunks, so she ended up strimming by hand anyway. A mid-width machine would have saved her that extra job. Measure your narrowest gap and your tightest corner before you commit.
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Cutting height adjustment: the feature you’ll use every week
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How easily you can change cutting height matters more than most buyers expect. Grass wants to be cut at different heights through the season — shorter in spring when it grows fast, taller in summer heat to protect the roots. A mower with a single lever that adjusts all wheels at once is a genuine quality-of-life feature. Individual wheel levers are fiddly and you’ll avoid changing height because it’s annoying.
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Check the range too. A mower that only cuts between 3 and 6 centimetres is fine for a manicured lawn but useless if you’ve let the grass grow tall after a holiday. A range stretching up to 7 or 8 centimetres gives you flexibility.
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How to test at home: before buying, physically operate the height lever on a display model. If it’s stiff, awkward, or requires two hands, imagine doing it weekly for ten years. That small friction adds up.
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Grass collection: bag, mulch, or rear discharge
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Do you want to collect the clippings or leave them on the lawn? Mulching mowers chop clippings finely and drop them back as natural fertiliser — great for lawn health, less good if the grass is wet and clumps form. Collection bags give a tidy finish but fill quickly and add weight. Rear discharge spreads clippings behind you, which is fast but leaves a visible trail.
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The size of the collection bag, if you choose one, is worth checking. A small bag on a large lawn means constant trips to the compost heap. For a big lawn, look for a bag capacity that lets you finish a decent stretch before emptying.
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Real-world case: on a damp morning, mulching clumps badly and smothers patches of grass. If you often mow when there’s dew, a collection bag is the safer bet. If you mow dry and want to feed the lawn, mulching pays off.
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Terrain and wheel size: don’t overlook the ground underfoot
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A flat, even lawn is forgiving. A sloping garden, bumpy ground, or a lawn with dips demands bigger wheels and better grip. Larger wheels roll over uneven ground more smoothly and reduce the effort you put in. On slopes, traction matters — small wheels spin and tear the turf.
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If your lawn slopes, push a mower up and down the slope rather than across it, and favour a machine with good weight distribution. Self-propelled mowers take the strain out of pushing uphill, though they add weight and cost. For a genuinely steep garden, that assistance is often worth it.
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Test at home: walk your lawn and note the slopes and bumps. If you’re breathless pushing a shopping trolley up your garden, you’ll want either big wheels or self-propulsion.
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Ease of maintenance: the long-term cost of ownership
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Every mower needs care, and the simpler the machine, the less there is to go wrong. Petrol engines need oil changes, air filter checks, spark plug attention, and fresh fuel each season. Battery and corded electric mowers need almost nothing beyond a clean and a sharp blade. That difference matters if you’d rather garden than tinker.
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The blade is the part that affects cut quality most. A dull blade tears grass instead of slicing it, leaving brown tips and inviting disease. Learn how often yours needs sharpening — typically once or twice a season for regular use — and whether you can do it yourself or need a service.
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Concrete example: someone who leaves petrol in the tank over winter often faces a mower that won’t start in spring. Draining the fuel or using a stabiliser before storage prevents that headache entirely. Electric owners skip this ritual altogether.
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Storage and weight: the practical reality
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Where will the mower live? A heavy petrol machine needs a shed with a ramp or level access. A lightweight electric mower can hang on a wall or tuck into a corner. Folding handles and vertical storage save real space in a small garden.
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Weight also affects daily use. If you need to lift the mower over a step or carry it to a front lawn, a lighter machine wins every time. Check the weight before buying and imagine carrying it — not just pushing it.
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FAQ
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How wide should my mower’s cutting deck be?
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Match it to your lawn’s shape, not just its size. Wide decks suit open lawns; narrow decks suit gardens with obstacles and tight gaps. Measure your narrowest passage first.
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Is a battery mower powerful enough for thick grass?
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For most domestic lawns, yes, provided you choose a machine with enough runtime and keep the blade sharp. For very large or consistently overgrown lawns, petrol remains more dependable.
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How often should I sharpen the blade?
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Once or twice a season for regular mowing. If you notice ragged, brown-tipped grass after cutting, the blade is dull and needs attention.
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Conclusion
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Power, cutting width, and maintenance are the three pillars of a good mower choice. Get the power source right for your lawn’s size and terrain, pick a cutting width that fits your garden’s shape, and choose a machine whose upkeep you’ll genuinely keep on top of. Add sensible attention to height adjustment, collection, wheels, and storage, and you’ll have a mower that serves you for years.
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For a broader look at the whole category, including how these criteria fit together across different garden types, a more complete guide on the general theme is available on the site.
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To go further, discover the selection criteria: Lawn mower: power, cutting width and maintenance criteria
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Last updated 2026-09-24
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Written by our editorial team at WiseHomeGuides, home and pet specialists.
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