Head to head

Stump grinder versus stump shear

Grind the stump in place, or extract the root mass?

9 criteria compared

These machines do fundamentally different things. A grinder reduces the stump to chips with a high-speed cutter wheel, leaving the root mass below the cut depth. A shear penetrates, splits, loosens, extracts and handles the whole stump.

The choice is decided by the required site outcome, not by machine size.

Framing

Why this comparison recurs

These machines are frequently priced against each other and almost never do the same job. A grinder reduces a stump to chips and leaves the root mass below cut depth. A shear penetrates, splits, loosens and extracts the whole stump, root mass included.

The decision is therefore about the site outcome, not the machine. What must the ground look like when the work is finished, and how many stumps are there per hectare?

Scale is the second axis. Grinding is priced per stump and dominated by setup on scattered work; shearing is priced per hectare or per stump at density and dominated by extraction force and rehabilitation.

What each is for

These are not two points on one scale

Most of the confusion in this comparison comes from reading them as better and worse versions of the same thing. They are built for different work.

A grinder finishes one stump

It reduces the stump in place to a depth, leaving chip and soil and ground that can be used afterwards. The specification that matters is below-ground cutting depth, because what the client is really buying is whatever comes next — turf, paving, planting.

Best at

Individual stumps in accessible urban and semi-rural settings
Work where the ground must be usable immediately afterwards
Sites too confined for a carrier and heavy attachment
Jobs following a tree removal on the same visit

A shear clears an area

It splits and lifts the stump out, which suits site preparation and stump recovery across hectares rather than finishing individual stumps. It needs a carrier, it disturbs more ground, and it scales in a way grinding cannot.

Best at

Plantation conversion and re-establishment at area scale
Land clearing where stumps must come out before earthworks
Stump recovery where a biomass outlet exists and tolerates soil
Sites with carrier access and room to work

Side by side

The comparison

Criterion	Stump grinder	Stump shear
Urban finish	Excellent	Poor
Minimise excavation	Excellent	Poor
Remove root mass	Poor	Excellent
Biomass recovery	Poor	Excellent
Plantation conversion	Fair	Excellent
High stump density	Moderate	High
Individual isolated stump	Excellent	Overkill
Site rehabilitation needed	Minimal	Backfill and levelling
Unit of production	Minutes per stump	Stumps per hour at scale

The decision

Which one, and when

Choose stump grinder when

Arboriculture, landscaping, parks and council work on scattered stumps
Sites where excavation must be minimised and finish quality matters
Access-constrained urban work
Individual stumps rather than whole-area conversion

More detail →

Choose stump shear when

Large-scale land conversion where root mass must be removed
Plantation re-establishment ahead of tillage or planting
A confirmed biomass destination for extracted stump material
High stump density where stumps per hour drives the rate

More detail →

The decision rule

Start from the objective, not the machine: what must this site look like when you leave, and how many stumps are there per hectare?

The money

How the two differ on cost, specifically

Capability comparisons are easy to find. This is where the commercial difference actually sits.

Factor	Stump grinder	Stump shear
Unit of production	Minutes per stump	Stumps per hour at density
Dominant consumable	Teeth and pockets	Tines, jaws, cylinder seals
What drives cost	Soil contamination and access	Soil type, moisture and root collar size
Site remediation	Minimal — chip backfill	Voids requiring backfill and levelling
Biomass recovery	None	Extracted stumps have potential value
Best economics at	Scattered individual stumps	High stump density over area

What would change the answer

The variables that move this decision

Read across the row your own situation matches. Where most rows point the same way, the decision is straightforward; where they split, the comparison is genuinely close and the economics below should settle it.

Variable	Points to stump grinder	Points to stump shear
Scale of the work	Individual stumps	Stump density across hectares
What happens on that ground next	Turf, paving, planting — must be usable	Earthworks or cultivation
Carrier access on site	Restricted; gates and surfaces	Open, carrier access available
Whether stumps have a biomass outlet	No	Yes, and the buyer tolerates soil
Acceptable ground disturbance	Minimal	Substantial disturbance acceptable

Three situations

What we would actually recommend

Not a balanced summary — a recommendation for each case, with the reasoning.

Residential, council and landscaping stumps, scattered across a city

Choose: Stump grinder

Access decides everything, finish quality matters, and excavation must be minimised. A machine that fits a standard gate and sets up in ten minutes out-earns a more powerful one that cannot reach the stump.

Plantation or orchard conversion ahead of cropping or replanting

Choose: Stump shear, or a forestry tiller

The root mass has to come out or be processed in place. Grinding at hectare scale is uneconomic and leaves roots that interfere with subsequent tillage and planting.

Development site needing complete root removal before earthworks

Choose: Stump shear on the carrier already on site

Avoids a separate mobilisation, and the excavation and backfill work is already within the earthworks scope. Confirm the compaction specification for the backfilled voids.

The arithmetic

Why the two are priced in different units

1Grinding is quoted per stump because the cost is dominated by travel, setup and getting the machine to the stump — all of which recur per job rather than per hectare.
2On scattered urban work, a crew may complete a handful of jobs in a day, with actual grinding a minority of the time on site.
3Shearing is quoted per hectare because the cost is dominated by stump density and carrier hours across an area, with mobilisation spread over a whole site.
4Attempting to convert one to the other — pricing area work from a per-stump rate, or individual stumps from a hectare rate — ignores which costs actually recur.

The units are not a convention. They reflect genuinely different cost structures, and quoting in the wrong one systematically misprices the work.

If you find yourself converting between the two, that is usually a signal the job belongs to the other method. Price it in the unit its costs actually behave in.

What goes wrong

Mistakes specific to this decision

How to settle it

The order to work through, for your own case

Each step narrows what the next has to establish. Worked in order, most buyers find the decision resolves before the last one.

Ask what the stump is actually in the way of

Turf, paving and planting need a finish depth; earthworks need the stump out; regrowth control may need neither if treatment satisfies the objective. The answer decides the method before any machine is considered.

Measure stump diameter at ground level

Not at breast height and not from the standing tree. Stumps flare at the base, so a measurement taken anywhere else understates what a shear has to engage or a grinder has to reduce.

Check access across your actual client base

In urban and semi-rural work, the machine that reaches the stump completes the job. A larger machine excluded from half your sites earns less per year than a smaller one that fits.

Establish where the arisings go

Grinding leaves chip and soil; shearing produces bulky stumps carrying soil that limits what a biomass buyer will accept. Either way it is a cost, and stump quotes routinely omit it.

Confirm underground services before pricing

Below-ground work in any developed setting requires the location of services to be established through the appropriate enquiry process and confirmed on the ground. It is part of the work, not overhead on it.

Often overlooked

The option that is not on this page

Leave them, or treat them chemically

Not every stump has to be removed mechanically. Where the ground will not be cultivated or built on, and regrowth is the only concern, treatment may satisfy the objective at a fraction of the cost. It is worth asking the client what the stump is actually in the way of before pricing its removal — sometimes the honest answer is nothing.

Common questions

Frequently asked questions

Which is cheaper, grinding or shearing?

Grinding is cheaper per individual stump; shearing is cheaper per hectare at density. They cross over somewhere that depends on stump spacing, soil and whether root mass has to be removed. For a single garden stump, grinding every time. For plantation conversion, shearing or tilling.

Does stump shearing damage the site?

Yes, by design — removing root mass means disturbing soil and leaving a void. Where the site must be returned to cropping or built on, backfill and compaction belong in the quote rather than being discovered afterwards.

Can extracted stumps be sold as biomass?

Where an offtake exists, sometimes. The deciding factor is the contamination limit, because extracted stumps carry soil. Confirm the specification in writing before treating biomass as revenue rather than a disposal cost.

Detail