Look at the lawn outside any cricket ground, bowling green or championship golf course and you are looking at the work of a cylinder mower. Look at almost any domestic garden and you are looking at the work of a rotary. There is a real and measurable reason groundskeepers refuse to use the rotaries that most homeowners default to, and it has nothing to do with snobbery. It comes down to two completely different ways of cutting a grass blade, and the difference shows up in how the lawn looks, how often it gets diseased, and how quickly it recovers from being walked on.
How Each Type Actually Cuts the Grass
A rotary mower has a single horizontal blade that spins at high speed (typically 3,000 to 3,500 rpm on a petrol model, 2,800 to 3,200 on a battery model). It does not so much cut the grass as smash through it. The blade is essentially a thin metal bar moving at around 230 kilometres per hour at its tip. When it meets a grass blade, it severs the leaf through sheer kinetic force, similar to a hatchet hitting a sapling. The cut is fast, the cut works on almost anything, and the cut is messy. Under a microscope a rotary-cut grass blade has a torn, ragged end with frayed fibres exposed to the air.
A cylinder mower (called a reel mower in the United States) works on a fundamentally different principle. It has a horizontal cylinder fitted with five, six, seven or even ten curved blades that rotate around a horizontal axis. These spinning blades pass against a stationary bottom blade (called the bedknife) with a clearance of around 0.075mm to 0.13mm, less than the width of a human hair. The grass is trapped between the moving blade and the bedknife and sheared cleanly, in exactly the same way a pair of scissors works. The cut end is flat, smooth, and looks under a microscope like a clean knife cut on a green vegetable.
Why the Cut Quality Affects the Whole Lawn
The torn end left by a rotary mower has several knock-on effects that play out over the next week. The damaged tissue cannot heal cleanly, so the grass blade loses moisture through the wound for the next 48 to 72 hours. In dry weather this shows up as a yellow or brown halo at the tip of every blade. The lawn looks dull and tired even though it was mown yesterday. The exposed tissue is also vulnerable to fungal infection. Red thread, dollar spot and fusarium patch all enter the plant most easily through wound sites, and a lawn that has been ripped rather than sheared offers tens of thousands more entry points per square metre than a cleanly cut one.
The clean shear from a cylinder mower seals naturally within hours. The grass plant produces a thin protective callus across the cut, locking moisture in and pathogens out. This is why bowling clubs and championship cricket squares can mow daily for months without disease outbreaks: the plants are not constantly fighting fresh infections.
There is a second, more dramatic difference. Cylinder mowers cut at heights that rotary mowers simply cannot reach. A typical domestic rotary will go down to about 25mm (1 inch) at the lowest setting. A cylinder mower for a fine ornamental lawn can be set to 5mm (0.2 inches) on a championship green, and 10 to 15mm (0.4 to 0.6 inches) on a domestic fine lawn. At those heights the visual effect changes completely. Light reflects off the dense, even canopy of leaves rather than scattering through gaps, and the lawn takes on the velvety sheen you see in formal gardens. You cannot achieve that look with a rotary at any blade height because the cut is not clean enough to support the density.
When a Cylinder Mower Is Worth the Money
The case for a cylinder is strong if three things are true. First, your lawn is reasonably flat (cylinders struggle with significant bumps because the bedknife scalps high spots). Second, your grass is a fine-leaved species (fescue, bent or hybrid ryegrass blends rather than coarse meadow mixes). Third, you are willing to mow at least twice a week during the growing season and once a week during the shoulder seasons. Cylinders work on the principle that they remove a small amount each cut. If you let the grass grow long and then try to cylinder-mow it, the blades cannot reach far enough through the canopy to cut anything and you just bend the grass over.
If those three conditions hold, the entry-level cylinder for serious domestic use is the Allett Liberty 35 (around £1,440/$1,800 with battery and charger). It is 35cm cutting width, 40V cordless, and adjustable from 6mm to 32mm cutting height. The Allett Classic 14L petrol model (around £1,299/$1,625) is the alternative if you have a larger lawn and prefer petrol, with a 36cm width. For traditionalists, the Hayter Harrier petrol cylinder mowers (around £700 to £1,200 depending on width) remain a respected option, though Allett dominates the current homeowner market.
A budget option for very small fine lawns (under 50 square metres or about 540 square feet) is a hand cylinder mower with no engine at all. The Webb H18 hand mower (around £130/$165) has a 45cm cutting width and works through pure mechanical action. On a flat well-maintained lawn it gives a finish that rivals machines costing ten times as much, and it weighs only 9kg so it is easy to store. The catch is that it physically demands you to mow before the grass exceeds about 30mm, because the cylinder cannot handle taller material.
When a Rotary Is the Right Choice
For most domestic gardens, a rotary is the better tool. Rotaries handle uneven ground because the single blade spins above whatever ground contour passes beneath the deck, rather than relying on a precision clearance like a cylinder does. Rotaries cope with long grass, wet grass (although you should not mow wet grass anyway), wildflower patches, and the occasional twig or leaf litter. They are cheaper to buy, cheaper to maintain, and forgiving of irregular mowing schedules.
If your lawn is a utility space rather than a feature, with kids, dogs, garden furniture, and a mix of grass species that includes some clover and possibly meadow grass, a quality rotary is the correct answer. The Honda IZY HRG 466 SK petrol rotary (around £610/$770) is the long-term workhorse choice, with its overhead-cam engine specifically designed for low-vibration domestic use and a lifespan that routinely passes 15 years with basic maintenance. For battery alternatives, the EGO Power+ LM2135E-SP (around £750/$940) gives 80 minutes of run time on a 7.5Ah battery and is the closest cordless equivalent to a petrol mower in cutting power.
The Hidden Maintenance Cost Nobody Talks About
The reason most people who buy a cylinder mower end up regretting it is the blade adjustment. The 0.1mm clearance between cylinder and bedknife drifts over time. After 20 to 30 hours of use the gap widens, the cut quality drops, and the mower starts crushing rather than shearing. Restoring the cut requires backlapping (running an abrasive paste through the cylinder while the bedknife is in contact), which takes about an hour and costs around £15/$20 in materials per service. Most domestic users either skip this step (and slowly lose cut quality), or pay a specialist £80 to £120 per year to do it for them.
A rotary needs the blade sharpened or replaced once a year. A replacement blade costs £15 to £30 ($20 to $40) and can be swapped out with a single spanner in 15 minutes. The maintenance burden is dramatically lower.
If you are prepared to accept the cost of backlapping (or to learn how to do it yourself, which the Allett user manual covers in detail), and you want the genuine showpiece-lawn finish, a cylinder is the right buy. If you want a mower that will start every time, cut anything you throw at it, and demand nothing from you except a sharpen once a season, a rotary is the rational choice. The cylinder is not a better mower; it is a more demanding one that produces a better finish on the specific kind of lawn it was designed for.
The Pragmatic Answer for Most Gardens
Buy the rotary. Mow at 30mm (about 1.2 inches) for a utility lawn or 25mm (1 inch) if you want a slightly finer finish. Keep the blade sharp. Mow twice a week from late April to early September, and weekly outside that. The result will be a healthy, dense lawn that handles the realities of a domestic garden. If after three years of doing this properly your lawn is truly flat, free of weeds, and you are still wanting more, then the cylinder upgrade becomes a defensible purchase. Until that point, the equipment is not what is holding your lawn back. The mowing schedule and the blade sharpness are.
