Bonsai Branch Cutter vs Knob Cutter: What’s the Difference?

Quick answer: a bonsai branch cutter and a knob cutter both create recessed cuts, but they are shaped for different stages of the work. A branch cutter is mainly used to remove a branch close to the trunk. A knob cutter has a rounder cutting head and is especially useful for hollowing or refining the area after a branch has been removed.

Branch cutter vs knob cutter at a glance

What is a bonsai branch cutter used for?

A bonsai branch cutter—often called a concave cutter—is designed to remove a branch close to the trunk while leaving a controlled recess rather than a projecting stub.

The SUWADA Branch Cutter is made from Japanese high-carbon steel and is currently available in 18 cm and 20.5 cm sizes.

The smaller size gives more control on smaller trees and in tighter areas. The larger size gives extra reach and leverage when the scale of the work calls for it.

What is a knob cutter used for?

A knob cutter has a much rounder head. Instead of primarily approaching an intact branch from either side, its jaws are shaped to remove a rounded section of wood from the surface.

That makes it useful when:

• a branch has already been removed;
• a raised section remains around the cut;
• the recess needs further shaping;
• you need to remove wood from a confined area.

The SUWADA Knob Cutter is approximately 21 cm long and is also made from Japanese high-carbon steel.

Its role is therefore better thought of as refining the branch-removal area rather than replacing a branch cutter entirely.

Why make a concave cut on bonsai?

When a branch is removed, the shape of the remaining surface matters.

A flat cut can leave material projecting from the trunk. A controlled recess leaves space for the surrounding tissue to develop over the wound without first having to cover a raised lump.

That is why specialist bonsai cutters have jaw shapes that look unusual compared with ordinary garden cutters.

The objective is not simply to cut the branch. It is to control the shape of the surface that remains.

Do I use the branch cutter or knob cutter first?

For an established branch, the practical sequence is usually:

remove the branch → inspect the surface → refine only if necessary

The branch cutter is therefore normally the first specialist cutter involved.

After the branch is removed, assess what remains. If the surface is already sufficiently recessed and clean, there may be no reason to remove additional wood.

If a central knob, uneven area or excessive projection remains, the knob cutter can be used to refine it.

Do not make every wound deeper simply because you own a knob cutter. The amount of material removed should be dictated by the tree and the cut in front of you.

Can I remove a whole branch with a knob cutter?

A knob cutter can remove relatively small pieces of wood, but that is not its main role in the SUWADA tool system.

Its rounded head is less convenient for approaching many intact branches cleanly at the trunk. A branch cutter is shaped more naturally for the initial removal.

The knob cutter becomes particularly useful once you are working into the remaining wood rather than through an intact branch.

Can a branch cutter do the job of a knob cutter?

There is some overlap.

A branch cutter already creates a recessed cut and may produce all the hollowing you need.

But the shapes are different. The round jaws of a knob cutter can remove material deeper in the centre of a wound or approach a raised area from angles that are awkward with the longer profile of a branch cutter.

A useful way to remember the distinction is:

Are you removing the branch, or refining the wood that remains?

Which should a beginner buy first?

If you are buying only one of the two, a branch cutter is usually the more useful starting point.

Removing established branches close to the trunk is a common part of structural bonsai work, and the tool already creates the controlled recess that distinguishes it from a normal flat pruning cut.

A knob cutter becomes more useful as you begin doing more wound refinement and heavier structural work.

For many growers, the progression is therefore:

bonsai scissors → branch cutter → knob cutter → more specialised tools

The exact order still depends on the trees you grow and the work you actually perform.

What about ordinary secateurs?

Secateurs and bonsai branch cutters solve different problems.

Secateurs are excellent for pruning live branches where you want a clean cut through the material. A bonsai branch cutter is shaped specifically for removing a branch very close to the trunk and controlling the geometry of the remaining surface.

Trying to make the same recessed trunk cut with ordinary secateurs is difficult because their jaws are not designed to remove wood in that shape.

So, branch cutter or knob cutter?

Use a branch cutter when the main task is removing the branch.

Use a knob cutter when the branch is already gone and the remaining area needs deeper or more rounded refinement.

If you are buying your first specialist bonsai cutter, the branch cutter is generally the more logical starting point. If you already perform substantial structural pruning and regularly need to refine wounds after the first cut, the knob cutter adds a useful second geometry.

For the wider tool system, read Japanese Bonsai Tools Explained: What Each Tool Does, or compare the current range in the Japanese Bonsai Tools collection.