Best Mulching Mowers

1. How We Picked

Almost every mower sold today claims to mulch. Most of them are really side-discharge or bagging mowers that mulch when you fit a plug, and their decks are shaped to throw clippings out rather than hold them in. So our first filter was deck design: we favored mowers whose decks are built around mulching, such as Toro's Recycler, or whose blade systems are, such as EGO's Select Cut.

Our second filter was power. Mulching loads a mower more heavily than discharging, because clippings stay under the deck and the blade cuts them several times. A mower with too little torque slows down, and a slow blade tears and smears rather than cuts, leaving wet green clumps. We looked at published torque ratings and at how each mower holds blade speed in thick grass.

We then checked every model against its manufacturer's specifications for deck material, cutting-height range, drive type and warranty, and dropped anything we could not confirm is still sold new. That removed the Honda HRX217, whose MicroCut twin-blade system was for years the benchmark for mulching. Honda stopped building gasoline walk-behind mowers for the US in September 2023, so a new HRX today is old stock. Several of our picks come from the same range as our best self-propelled lawn mower guide, because self-propel makes it easier to slow down in heavy patches, which is one of the simplest ways to mulch better.

We included both gas and battery mowers, and we have been blunt about where battery power falls short. Good battery mowers now mulch well, but the cheaper ones still struggle, and mulching shortens runtime more than most buyers expect. If you are deciding between power sources, our best gas lawn mowers and best electric lawn mower guides cover each in more depth.

Finally, we weighed what mulching actually requires from the owner. No mower mulches well if the grass is too long, too wet or cut with a dull blade, so this guide spends as much time on those habits as on the machines.

2. What Makes a Mower Mulch Well

A mulching mower does one thing differently from a discharging mower: it keeps clippings under the deck long enough to cut them again. A discharge mower cuts the grass once and throws it out of the chute. A mulching mower closes that chute and uses the shape of the deck and the airflow from the blade to circulate clippings back into the blade path, so a single blade of grass is cut into several small pieces before it falls. Small pieces drop down between the grass blades to the soil. Large pieces sit on top of the lawn and look untidy.

Deck shape is the main difference. A dedicated mulching deck, such as Toro's Recycler, has a domed or tunnel-shaped underside and no permanent discharge opening, so the airflow circulates clippings instead of pushing them out. A convertible 3-in-1 deck has a discharge opening that is blocked with a plug when you want to mulch. That works, but the deck is shaped to throw clippings sideways or backward, so the circulation is less effective and the pieces are larger.

Blade count and design matter too. Twin-blade systems, such as Toro's Atomic blades on the TimeMaster or EGO's stacked Select Cut blades, cut clippings twice on each pass and produce finer mulch. A single mulching blade with extra cutting surfaces along its curve does a similar job on a smaller scale.

Deck material affects mulching over time. Wet clippings stick to the underside of a deck, and the build-up disrupts the airflow that makes mulching work. Heavy steel and cast aluminum decks resist denting that traps debris, and a smooth underside is easier to scrape clean. A washout port, which lets you hose out the deck, is worth having on any mulching mower.

3. Our 7 Top Picks

The mowers below all mulch well, but they get there in different ways: some through a deck built around mulching, others through twin or stacked blades, and the best through both. We ranked them by how finely and consistently they mulch in a typical lawn, then by practicality. The Toro Recycler Max leads because it combines a dedicated mulching deck with a heavy steel shell at a mainstream price. The EGO LM2156SP is the best choice if you want battery power, and the TimeMaster suits large lawns.

5

Greenworks Pro 80V 21" Brushless Self-Propelled Mower

80V Battery, Steel Deck, 3-in-1

Best Value Battery

4.4 (3,000 owner ratings)

The Greenworks Pro 80V is the best-value battery mower we would recommend for mulching. Its 80V platform and brushless DigiPro motor give it more power than most mowers at its price, and Greenworks rates it as comparable to a 160cc gas engine, which is fair for normal grass. The 21-inch steel deck is a real advantage over the plastic decks on cheaper battery mowers, since steel holds its shape and resists the build-up of wet clippings better. It is a 3-in-1 design, so it mulches, bags or side discharges, and the rear-wheel self-propel with 10-inch rear wheels makes it comfortable on uneven ground. Greenworks rates the 5.0Ah battery at up to 70 minutes, and the pack also runs the rest of the Greenworks 80V range. The limits show up in two places. The maximum cutting height is 3-3/4 inches, which is fine for most of the year but a little low for mulching cool-season grass in midsummer, when a taller cut helps the lawn and the mower both. And in dense, damp grass, blade speed and runtime drop faster than on the EGO. Mowed weekly, before the grass gets long, it mulches well and costs considerably less than the premium battery models.

Pros

• 80V brushless motor rated by Greenworks as comparable to a 160cc gas engine
• 21-inch steel deck with mulch, bag and side-discharge options
• Up to 70 minutes of rated runtime on the 5.0Ah battery
• Rear-wheel self-propel and 10-inch rear wheels
• 4-year limited tool and battery warranty

Cons

• Maximum cutting height of 3-3/4 inches is lower than we would like for mulching in summer
• Mulching dense grass drops runtime and blade speed more than on the EGO

The Bottom Line

A capable, well-priced battery mulcher for regular weekly mowing on small and medium lawns.

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7

EGO Power+ LM2206SP 22" Aluminum Deck Self-Propelled

56V Battery, Cast Aluminum Deck, 11.1 ft-lb

Premium Battery Pick

4.5 (400 owner ratings)

The LM2206SP is EGO's answer to the question of whether a battery mower can mulch as well as a strong gas mower in any conditions. EGO rates it at 11.1 ft-lb of torque with blade speeds up to 3,350 RPM, the highest figures of any battery mower here, and that headroom shows when the grass is thick or a little long, the two situations where weaker battery mowers leave clumps. It uses the same Select Cut system as the LM2156SP, with a fixed upper blade over an interchangeable lower blade, so clippings are cut twice before they drop. The deck is the other distinguishing feature. Cast aluminum does not rust, which matters on a mulching mower because wet clippings sit against the underside of the deck all season, and EGO backs the deck with a lifetime warranty on registration. A smooth cast underside is also easier to scrape clean, which keeps airflow and mulching performance consistent. EGO rates the 10.0Ah battery at up to 70 minutes, and the Touch Drive self-propel runs from 0.9 to 3.1 mph. The objection is price: it costs far more than the Toro Recycler Max, which mulches about as well. Buy it if you are committed to battery power and want the best, not because you need it to mulch well.

Pros

• 11.1 ft-lb of torque and blade speeds up to 3,350 RPM, the highest of any battery mower here
• Cast aluminum 22-inch deck will not rust, and wet clippings are easier to clean off
• Select Cut Multi-Blade system with interchangeable lower blades
• Eight cutting heights from 1 to 4 inches
• Lifetime deck warranty on registration

Cons

• The most expensive mower in this guide by a clear margin
• Newer model with less long-term owner data than the LM2156SP

The Bottom Line

The strongest battery mulcher we recommend, for buyers who want gas-like torque and a deck that will outlast the mower.

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4. Mulching Blades vs Standard Blades

A standard, or high-lift, mower blade has a large upswept wing at its trailing edge. The wing generates strong lift, which stands the grass up for cutting and blows clippings out of the chute or up into the bag. That is exactly what you want for bagging, and less than ideal for mulching, because it throws clippings out of the blade path before they can be cut again.

A mulching blade, sometimes called a 3-in-1 or all-purpose blade, has a longer, curved cutting edge and often additional cutting surfaces along the wing. It produces less lift and more circulation, so clippings stay in the deck and get cut several times. Many mowers ship with a general-purpose blade that compromises between the two, and fitting a proper mulching blade is one of the cheapest upgrades you can make to a mulching mower. Our best lawn mower blades guide covers which replacement blades fit which mowers.

Sharpness matters even more for mulching than for bagging. A sharp blade slices each clipping cleanly, producing small pieces that fall to the soil. A dull blade tears grass, leaving shredded tips that brown and lose moisture, and it produces ragged, stringy clippings that clump together and sit on top of the lawn. If your mower mulched well last spring and leaves clumps now, the blade is the first suspect.

How often to sharpen depends on how much you mow and what your mower hits. Our guide to how often to sharpen mower blades covers the signs and the method in detail. Keep a spare blade so you can swap it in and sharpen the dull one at your convenience.

One caution: always replace a blade with one specified for your mower. Blade length, center hole shape and lift all matter, and the wrong blade can reduce cutting quality, overload the engine or motor, or come loose.

5. The One-Third Rule

The single most important habit for mulching is never to remove more than one-third of the grass blade in a single mowing. If you keep your lawn at 3 inches, mow it when it reaches about 4.5 inches. Let it grow to 6 inches and you are asking the mower to mulch twice the volume of clippings, which no mower does well.

The rule exists for the grass as much as for the mower. Cutting off more than a third of the leaf at once removes much of the plant's ability to photosynthesize and shocks it. The grass responds by putting energy into regrowing leaves rather than roots, which leaves the lawn weaker, more drought-sensitive and more open to weeds. A lawn that is regularly scalped this way thins out over a few seasons.

For mulching, the rule is also what makes the clippings disappear. Short clippings, an inch or so at most, fall down between the grass blades and are out of sight by the next day. Long clippings from overgrown grass lie on top of the lawn, block light and look messy, however good the mower.

In spring, when growth is fastest, that often means mowing every five days or so. If you fall behind, do not try to catch up in one pass. Raise the deck to its highest setting, mow, and then lower it over the next two or three mowings. Alternatively, bag or side discharge for one mowing and return to mulching once the lawn is back under control.

6. Wet Grass and Clumping

Wet grass is the other main cause of poor mulching. Wet clippings are heavy and sticky, so instead of circulating in the deck they cling to its underside and to each other. The deck fills up, airflow drops, blade speed falls, and the mower leaves wet, green clumps behind it. Those clumps can smother the grass underneath and leave yellow patches if they are not broken up.

The best fix is to wait. Mow mid-morning once the dew has dried, or late afternoon, and avoid mowing within a few hours of rain. If you have to mow wet grass, raise the cutting height a notch so the mower removes less, walk more slowly so the blade has time to process each clump, and consider switching to bagging or side discharge for that one mowing.

Battery mowers are more sensitive to wet grass than gas ones, because the extra load drains the battery faster and some models reduce blade speed to conserve charge. If your battery mower has a boost or high-torque mode, use it in damp grass.

Clean the deck regularly. A layer of dried clippings under the deck reduces the space the airflow needs, and every mowing after that mulches a little worse. After mowing damp grass, disconnect the spark plug or remove the battery, tip the mower as the manual directs, and scrape the underside. A washout port makes this quicker on the mowers that have one.

If you do leave clumps, they are easy to fix. Go over them again once they have dried, or rake them out. Do not leave them sitting on the lawn for more than a day or two.

7. Mulching Leaves Instead of Raking

A good mulching mower can save you most of your autumn raking. Research from Michigan State University, among others, has found that shredding leaves into a lawn with a mulching mower does no harm to the grass and can improve the soil, as the finely chopped leaves break down and feed soil life. It also saves the time and the bags that raking and hauling would take.

The key is how much you mulch at once. A thin layer of leaves, where you can still see grass between them, mulches easily. A thick layer does not: the mower cannot chop it finely enough, and the resulting mat smothers the grass over winter. So mulch leaves frequently through the autumn, weekly when trees are dropping heavily, rather than waiting for all the leaves to fall.

Aim for pieces around the size of a dime. At that size, they drop between grass blades and break down quickly. If your first pass leaves larger pieces, go over the area again, ideally at right angles to the first pass. Dry leaves shred much more easily than wet ones, so pick a dry afternoon.

If there are too many leaves to mulch, bag them instead and use them as compost or garden mulch. EGO's Select Cut mowers include a high-lift bagging blade that works well for this, and any of the 3-in-1 mowers here can bag shredded leaves. For clearing leaves from beds and paths first, a good leaf blower saves a lot of time; see our best leaf blower guide.

One caution: leaves hide sticks, stones and nuts. Walk the lawn before mowing to remove anything that could damage the blade or be thrown.

8. Can a Battery Mower Mulch?

Yes, but choose carefully. Mulching loads the blade motor more than discharging, because clippings stay under the deck and are cut several times. A battery mower with limited torque slows down under that load, and at lower blade speed it tears and smears grass rather than cutting it cleanly. Many cheaper battery mowers also reduce blade speed automatically to extend runtime, which saves charge at the cost of mulching quality.

The best battery mowers have largely solved this. The EGO LM2156SP and LM2206SP are rated at 8.3 and 11.1 ft-lb of torque, and both use EGO's stacked Select Cut blades, which cut each clipping twice. The Toro 60V Recycler uses the same mulching deck as Toro's gas mowers. In weekly mowing of a lawn kept at a sensible height, all three mulch about as well as a good gas mower.

The trade-off is runtime. Manufacturer runtime ratings assume dry, short grass. Mulching thick spring growth or damp grass uses energy much faster, and you should expect noticeably less than the rating. If your lawn is at the upper end of a battery mower's rated coverage, a second battery is a sensible purchase.

There is also a real advantage. A battery mower delivers full torque instantly and does not need to rev up, and most have a boost or high-torque mode for thick patches. Combined with a sharp blade and the one-third rule, a good battery mower is an excellent mulcher. See our best electric lawn mower guide for more options.

9. When to Bag Instead

Mulching should be your default. Grass clippings are mostly water and break down quickly, returning nitrogen and other nutrients to the soil. University extension services commonly estimate that leaving clippings on the lawn can supply up to a quarter of its yearly nitrogen needs, which means you can use less fertilizer. Our best fertilizer for grass guide explains how to adjust your feeding if you mulch.

A common myth is that mulched clippings cause thatch. They do not. Thatch is built up mainly from roots, stems and runners, which break down slowly, not from leaf clippings, which decompose within days. Mulching does not cause a thatch problem, though overfeeding and overwatering can.

There are times to bag. If the lawn has become overgrown and you cannot follow the one-third rule, bag for one or two mowings. If there is a fungal disease in the lawn, bagging removes infected material instead of spreading it. If weeds have gone to seed, bagging avoids spreading their seeds across the lawn. And when there are too many leaves to mulch, bag them for compost.

Slopes are another reason to mulch. A full bag adds weight behind the rear wheels, which makes a mower harder to control on a grade, so mulching is also the better choice on a sloped lawn. Our best lawn mower for hills guide covers which mowers handle slopes best.

A 3-in-1 mower gives you all three options, and every mower in this guide can mulch, bag or side discharge. Use mulching most of the time, and switch only when one of these exceptions applies.