Brush Hog or Bush Hog? What the Words Mean, and Rotary Cutter vs Flail Mower vs Forestry Mulcher
The Gibson Environmental Services crew
More than 10 years clearing land, cutting trails, and running forestry equipment in Southeast Michigan.
Brush hog and bush hog are the same machine. Bush Hog is a brand of rotary cutter, built in Alabama since the 1950s, whose name became the word for the whole category the way Kleenex did for tissues; brush hog is the everyday version of that name, and rotary cutter is the neutral term the equipment makers and the extension offices use. A university small-farms program puts it plainly: the implement most people call a bush hog is a rotary mower with hinged blades, and bush hog is a trademark.
The naming question is the easy one. The useful questions are what a rotary cutter is built for, how it differs from a flail mower and from a forestry mulcher, how thick a stem each one handles, and which one your field, fence row or overgrown lot needs. This guide answers those for Southeast Michigan ground, including how the skid steer brush hog we run on our brush hogging jobs differs from the pull-behind cutter on a farm.
Three Names, One Machine
| Name | What it is | Where you hear it |
|---|---|---|
| Bush Hog | A brand of rotary cutter; the company name became the generic word | Farm country, equipment dealers, older landowners |
| Brush hog | The everyday pronunciation and spelling of the same thing; also the verb, as in brush hogging a field | Most of Michigan, including us |
| Rotary cutter | The category: a mower with heavy blades on hinges under a steel deck, driven by a shaft or a hydraulic motor | Manufacturer catalogs, extension publications, specifications |
That program's description of the machine explains why it handles what stops a lawn mower: the blades are on hinges rather than bolted rigid, so they swing back when they hit something solid and swing out again by centrifugal force, and the edges are kept blunt enough to batter through dense growth instead of slicing it. That is why a rotary cutter shrugs off a hidden stump and a lawn mower throws a blade.
Pull-Behind Cutters vs a Skid Steer Brush Hog
The classic brush hog rides behind a farm machine on a three-point hitch and is driven by its power take-off; the same program notes the compact ones clear a strip five to six feet wide and the big bat-wing models stretch to fifteen. Our brush hog is different: it is a hydraulic attachment on the front of the same tracked skid steer that carries our forestry mulcher, so the cutter leads and the machine follows it into the growth.
Where the cutter sits
In front, so the operator sees the stem before the blades reach it, and can lift the cutter over a stump or a rock instead of hitting it blind behind the seat.
What drives it
Hydraulics from the skid steer rather than a shaft, which means the cutter can be tilted, raised and pushed into a thicket at any angle, including straight down onto a sapling.
Where it goes
Wherever a tracked machine goes: soft ground, slopes, tight fence rows and the woodlot edge, on tracks that spread the weight instead of rutting a wet field.
What it is built for
Grass, weeds, brambles, cattails, canes, light brush and saplings, cut as close to the ground as possible, with the chopped material left where it falls as a mulch unless you ask for something else.
One machine, two attachments, is the practical part. A fence row that is grass and brambles on one end and buckthorn and box elder on the other gets the brush hog on one end and the forestry mulcher on the other, in the same trip. Our guide to forestry mulching vs brush hogging goes through when each service is the right one.
Rotary Cutter vs Flail Mower
A flail mower is the other field mower, and the two are built around opposite ideas. A rotary cutter has two or three heavy blades swinging on a vertical shaft under a deck, so it hits hard and infrequently. A flail mower has dozens of small knives on a horizontal drum, so it hits light and often.
| Rotary cutter (brush hog) | Flail mower | |
|---|---|---|
| Cut quality | Coarse; stems chopped into lengths and left as a loose mulch | Fine; material shredded, closer to a finish cut |
| Thick stems and saplings | Its strength; the heavy blades batter through | Light brush only; thick stems stall the drum |
| Hidden debris | Blades swing back and keep going | Knives swing back too, and fine debris is less of a hazard |
| Thrown objects | Throws farther; needs a wide clear zone | Throws less, which is why road crews favor it |
| Speed on open ground | Faster | Slower |
| Best use | Fields, fence rows, pasture reclamation, light brush, saplings | Lawn-to-field edges, orchards, roadsides, places where a tidy finish matters |
Rotary Cutter vs Forestry Mulcher
The forestry mulcher is the next size of tool, built for the growth a rotary cutter is not: brush you can no longer walk through, saplings as thick as a wrist and up, small trees, and stumps. Its drum carries carbide teeth instead of swinging blades and grinds the whole stem, stump and all, into chips. A rotary cutter leaves a stem cut as close to the ground as the deck allows; the mulcher leaves the ground.
- Grass, weeds, canes and brush you can walk through: brush hog. Cheaper per acre, faster, and the right tool for annual maintenance.
- Brush you push through, saplings, young trees, invasive thickets, stumps you want gone: forestry mulcher.
- A field that has gone to saplings in the last three to five years: usually the mulcher for the first pass, then the brush hog every year or two to keep it.
- Fence rows and woodlot edges: often both, on the same trip.
The honest way to decide is to walk the ground with us. If you can walk it, the brush hog likely handles it; if you need to push, the mulcher does. Both come on the same machine, so there is no wrong call to unmake.
How Thick a Stem Each Tool Handles
Rotary cutters are sold by cutting capacity, the stem diameter the deck and the gearbox are rated for. Light-duty models are rated for saplings around an inch; medium and heavy-duty models for two to three inches; the heaviest skid steer brush cutters for more. A flail mower is rated for less than a rotary cutter of the same width. A forestry mulcher is rated by the tree, not the sapling, and grinds stumps as well as stems. Which is why the question on the walk-through is never whether something can be cut; it is which attachment does it cleanly and what you want left.
A note on what is left: a brush hog pass leaves stems cut as close to the ground as possible and the chopped material lying as a coarse mulch, gone by the second summer. The stumps of saplings cut this way sprout the next year, which is why a maintenance pass the following summer is part of the plan; our guide to stumps after forestry mulching explains the sprouting species.
When to Brush Hog in Michigan
Timing decides what a brush hog pass accomplishes. The extension weed scientists who tested it make the point for wild parsnip that mowing works when it lands after the flower heads emerge and before the seed matures; too early and the plant sends up a second stalk, too late and the seed is already made. The same logic runs the calendar for a field: a pass in late June or July catches the biennials and thistles before seed, a pass in late summer takes the sapling sprouts, and a fall pass sets the field up for winter. Our guides to fall brush hogging and the best time to clear land in Michigan lay out the months.
Common Questions
Is it bush hog or brush hog?
Both. Bush Hog is a brand of rotary cutter whose name became the generic word, and brush hog is the everyday version of it. Rotary cutter is the neutral term for the machine itself.
How thick will a brush hog cut?
Light-duty rotary cutters are rated for saplings around an inch, heavier models for two to three inches, and the heaviest skid steer cutters for more. Anything past that, and any stump you want gone, is forestry mulcher work.
Can a brush hog take down small trees?
Saplings, yes, within the cutting capacity the cutter is rated for. Small trees are what a forestry mulcher is built for, and it grinds the stump as well. On our jobs both attachments ride on the same skid steer, so the right one goes on for each part of the ground.
What is the difference between a brush hog and a flail mower?
A brush hog swings two or three heavy blades under a deck and chops stems coarse; it handles thicker material and moves faster. A flail mower spins dozens of small knives on a drum and shreds fine; it leaves a tidier finish and throws less, but stalls on thick stems.
What works better than a bush hog?
For growth you have to push through, a forestry mulcher. For a finish cut on a lawn edge, a flail. For an open field, nothing beats a rotary cutter for speed and cost; it is the right tool for most annual field mowing.
Can you brush hog in reverse?
A pull-behind cutter is designed to cut moving forward, and the deck behind the seat makes backing into brush a blind operation. A skid steer brush hog sits in front of the operator, so it is driven into the growth head-on with the stems in view.
What is left after brush hogging?
Stems cut as close to the ground as possible and the chopped material lying where it fell as a coarse mulch, unless you ask for it handled another way. It is gone by the second summer, and the sapling stumps that sprout get a maintenance pass.
Sources and Further Reading
The naming, design and sizing points come from Cornell University; the mowing-timing point from Iowa State University. How our own attachment is used is stated in the text.
Cornell Small Farms Program, Cornell University: Brush Hogs and Rotary Cutters: Multi-purpose Tools for the Small Farm
Iowa State University Extension and Outreach: Mowing requires management to be effective
Oregon State University Extension: Mastication (forestry mulching) as a slash treatment
Where We Do This Work
The work in this guide is done across eight Southeast Michigan counties from our base in Royal Oak. Every county page lists the townships we work in most, with a page for each.
Field, Fence Row or Overgrown Lot?
Walk it with us and we will tell you which attachment it needs and what the ground will look like after. The quote is free.