The Sharp Edge: How to Sharpen Secateurs, Loppers, Shears, Spades and Hoes

A cutting edge works by concentrating force into a narrow line, and sharpening restores that line. The risk is sharpening the wrong face: grinding a bevel onto the flat side of a bypass secateur changes how the two blades meet and can stop them closing cleanly, leaving a tool that cuts worse than before. Check the tool type first, keep the angle that is already on the blade, and sharpen only the bevelled face.

This covers hand tools: secateurs, loppers, hedge and hand shears, spades and hoes, worked with a whetstone, diamond file or metal file. Mower blades need their own technique: see the mower blade sharpening guide.

Signs a tool needs sharpening

You do not need a protractor to tell. A sharp pair of secateurs or loppers slices a stem in one pass; a dull one crushes and tears it, leaving a ragged, bruised end, and you squeeze harder or work the blade back and forth. On shears the crushing shows as torn, browning leaf tips a day or two after cutting a hedge. On spades and hoes a dull edge skates over the soil instead of biting in, and you find yourself leaning on it. Sharp tools are also safer and more efficient than blunt ones.

Why the bevel matters

The bevel is the angled face ground into the blade. A shallow, acute bevel gives a thinner edge that slices with less effort but rolls or chips more easily on tools that meet resistance, such as a spade hitting stone or loppers cutting knotty wood. A steeper bevel lasts longer but needs more force.

Anvil and bypass: why it changes the method

Bypass secateurs and loppers have two blades that pass each other like scissors. Only the sharp blade has a bevel, on its outer face. The flat inner face must stay flat: do not sharpen it, because that affects the cutting bite.

Anvil tools close a sharp blade straight down onto a flat metal bar and are bevelled on both sides of the blade, like a knife. Sharpening one on a single face throws the edge off-centre against the anvil. Never sharpen the anvil itself.

If you are not sure which you have, look at how the blades close: a blade closing onto a flat bar is an anvil, and two blades scissoring past each other are bypass.

What you need

• Whetstone: a double-sided stone with a coarse and a fine grit, oil or water type depending on the stone. Start on the coarse side to remove nicks and finish on the fine side. Roughly 200 to 400 grit is coarse and 800 to 1000 and above is fine.
• Diamond-coated file or pocket tool: works well on the small bevels of secateurs and loppers and is also suitable for spades and hoes. Diamond sharpeners generally need no oil.
• Metal file: a flat file suited to working metal, for removing nicks from spades and hoes. A single-cut file (one row of teeth) leaves a finer finish than a double-cut one.
• General-purpose oil and a rag for the pivot, spring and blade once you finish.
• A vice or clamp to hold the blade steady, plus gloves and eye protection.
• Optional: a honing guide or angle jig, if holding a steady angle by eye is difficult on a first attempt.

Hand tools are the safer choice for sharpening than a bench grinder: a grinder removes metal quickly and can overheat the steel enough to soften it, which is hard to do by hand.

Clean the blade first. Dried-on sap can be cleaned off with a nylon pan scourer or wire wool, and white spirit helps with stubborn residue. Clean soil off cultivation tools with a stiff brush. Cleaning matters for plant health too. Tools that have touched diseased material should be treated with a disinfectant such as Jeyes Fluid and left for 15 to 20 minutes before wiping. That matters when the same secateurs move between roses, fruit bushes and anything showing disease.

Many modern tools are stainless steel, which is less likely to rust. Carbon steel takes a fine edge but rusts faster if left wet, so dry and lightly oil any plain steel blade after every use. If a blade is badly pitted or the tip is chipped beyond what a file can restore, check whether the maker sells a replacement blade for that model before buying a whole new tool; many secateur makers sell spare blades.

Angle and method by tool

Match the existing angle. For secateurs a bevel of about 20 to 30° is typical, with 23° quoted as a working figure, but the original factory angle is the one to follow. Spade and hoe edges are blunter than pruning tools because a thin edge would roll or chip the first time it met a stone, and RHS guidance for these is to work at the same angle already there and not make the blade too thin.

Secateurs and loppers: step by step

1. Confirm anvil or bypass (above), and take the tool apart if it allows.
2. Clean the blade of sap, dirt and surface rust.
3. Sharpen only the bevelled face: the outer face on bypass tools, both faces on anvil tools. Match the existing angle.
4. Draw the file or stone across the bevel in one direction at a time, away from the edge, using long slow strokes, rather than scrubbing back and forth. Marking the bevel with a permanent pen first shows where metal is coming off: the ink should vanish evenly if your angle is steady.
5. Turn the blade over and remove the burr, a thin lip of metal pushed over the edge, with one or two light passes flat across the back. Do not bevel this face.
6. Reassemble, putting a few drops of oil on the central pivot and spring.
7. Test on a sheet of paper: a sharp, well adjusted blade cuts cleanly along its whole length with minimal effort.

Hedge shears and hand shears

BoltedA plant switching early into flowering and seed production, usually triggered by stress, after which leaves, roots or bulbs turn bitter or unusable. Full page → shears come apart and can be sharpened at home; riveted ones, or badly nicked blades that no longer meet flush, are better sent for professional sharpening or replaced.

1. Remove the central bolt and separate the blades.
2. Clamp one blade in a vice, bevelled face up.
3. With a fine whetstone or diamond file, work along the existing bevel from base to tip in one direction, keeping the angle steady, as for a single bypass secateur blade.
4. Remove any burr from the flat back with one or two light strokes.
5. Repeat on the second blade.
6. Reassemble with a drop of oil on the pivot, tightened enough to hold the blades together without binding.
7. Test on a stem or strip of card before using on the hedge.

Spades and hoes

The goal here is a working edge, not a fine polish, and sharpening once or twice a year is usually enough.

1. Brush off soil and any rust.
2. Clamp the tool or brace it securely.
3. With a metal file (or diamond file), work at the nicks along the existing bevel, pushing away from you across the blade at the same angle. Keep the file flat, and push in one direction: dragging back on the return risks dulling the edge you just made.
4. Continue until the edge feels even along its length and the nicks are out, without making the blade too thin.
5. Check the back face for a burr and remove it with a couple of light passes.
6. Test by pushing the edge into firm soil or turf: it should bite in, not skate. Wipe down and apply a light film of oil before storage.

Severely damaged blades are best taken to a professional sharpener.

Safety

• Wear gloves, and eye protection when filing.
• Cut and file away from your body, and keep fingers clear of the edge.
• Clamp the tool where possible: a slipped file or stone on an unsecured blade is a common way to get cut, more so than the finished edge.
• Keep others clear, especially with loppers and shears where force goes through a spring-loaded joint.

Storage in a wet climate

Bevel geometry does not change with climate, but rust risk between sharpens does. Drying a blade after cleaning stops metal rusting, and cutting tools should be stored somewhere clean and dry. Western Scotland is several times wetter than the south-east of England, which means more ambient dampness for a stored blade:

In an unheated shed or lean-to through a Scottish winter, treat drying and oiling as a routine step after every cleaning or sharpening session. Salt-laden air near the coast is likely to speed corrosion as well, on top of the rain. Grit and small stones dragged across a spade or hoe in stony ground can plausibly nick and blunt the edge faster than in a stone-free bed, which is one more reason to keep a blunter, more durable bevel on cultivation tools.

Common questions

Sources