Cleaning and Sharpening Garden Secateurs Properly

Why Clean, Sharp Secateurs Matter More Than You Think

Secateurs are the one tool most UK gardeners reach for several times a session, whether you are deadheading roses on an allotment, cutting back autumn raspberries, or taking hardwood cuttings from a neighbour's blackcurrant. Because they are used so often, they are also the tool most likely to be left dirty, damp and blunt in a shed or trug.

A blunt pair does not slice. It crushes and tears, leaving a ragged wound with shredded cambium and bruised bark. That wound dries out, dies back, and gives fungal spores an easy entry point. If you have ever pruned a rose with dull blades and watched the cut stem blacken over the following fortnight, you have seen this happen. Worse, sap on the blade carries spores and bacteria from one plant to the next, so a single uncleaned pair can spread problems such as honey fungus, canker or bacterial blight around a whole plot.

Five minutes of cleaning and sharpening every few sessions will keep cuts clean, save your hands from aching, and add years to the tool's life.

Routine Cleaning After Every Use

Getting into the habit of a quick wipe-down is the single most useful thing you can do. Do it before you put the secateurs away, not the following weekend when the sap has set like glue.

• Wipe the blades with an old cloth or a rag kept in the shed. Remove green sap, soil and any sticky residue from conifers or euphorbia, which sets hard and gums up the action.
• Scrub the pivot area with a small stiff brush, such as an old toothbrush. Grit collects around the centre bolt and is what makes secateurs stiffen and eventually seize.
• Disinfect between plants when you are working on roses, fruit trees or anything showing signs of disease. Wipe the blades with methylated spirits or an alcohol hand gel and let them dry for a few seconds.
• Dry thoroughly. Water left in the pivot is the main cause of a rusty bolt. A quick rub with a dry cloth is enough.

If you have been cutting anything diseased, clean the tool before it touches another plant. There is no point sterilising a knife and then carrying infection on the secateurs.

A Deeper Clean for Neglected Tools

If your secateurs have been sitting in a damp shed since last winter, give them a proper overhaul. Take them apart if the design allows: most bypass secateurs have a central bolt you can undo with a spanner or a coin, plus a spring that lifts out easily. Lay the parts on a tray so nothing rolls away.

Soak the metal parts briefly in warm soapy water, then scrub off rust with wire wool or a fine abrasive pad. For stubborn spots, a little white vinegar left on for ten minutes will lift surface rust, but rinse it off carefully afterwards because acid will pit the steel. Dry every part with a cloth, then warm the metal slightly with a hairdryer or leave it in the sun for half an hour to drive off residual moisture.

Anvil secateurs, where a straight blade closes onto a flat plate, need the same treatment, but be aware that the anvil plate can develop a groove over time. Once the blade is hitting the groove rather than sitting flat, replacement blades or a new pair may be the honest answer.

Sharpening the Bevel Without Ruining the Blade

Here is where most people go wrong. Bypass secateurs have two blades: a curved cutting blade with a single ground bevel, and a flat, blunt counter-blade. Only sharpen the bevelled side. Filing the flat face will open a gap between the blades and the tool will never cut cleanly again.

Clamp the blade securely, or hold it steady against a bench edge. Match the existing angle, usually around twenty to twenty-five degrees, and work a diamond file or a fine sharpening stone along the bevel from the base of the curve towards the tip. Use smooth, consistent strokes in one direction, following the curve rather than dragging straight across it. Five to ten passes is usually plenty.

Work on the flat side only to remove the burr: lay the blade perfectly flat on the stone and give it one or two gentle passes. You will feel a fine lip curl over as you sharpen the bevel; the flat pass takes it off. Test the edge on a piece of soft paper — a sharp blade will slice cleanly rather than snag. Never use a bench grinder or an angle grinder, as the heat will draw the temper from the steel and leave you with an edge that blunts within minutes.

Oil, Reassemble and Check the Spring

Once the blade is sharp, reassemble the secateurs and apply a light machine oil or camellia oil to the pivot bolt, the spring and any moving contact points. A drop is enough; too much oil attracts grit and sap. Work the handles open and closed a few times so the oil spreads, then wipe away the excess.

Check the spring carefully. A tired or bent spring is behind most "my secateurs have gone stiff" complaints, and replacements are cheap and easy to fit. Make sure the handles close with a light snap and that the blades meet along their whole length rather than just at the tip. If a gap remains, the pivot bolt is probably too tight or the blade is worn beyond saving.

Storing Them Well Through the Year

Hang secateurs on a hook in a dry shed rather than dropping them in a bucket of tools, and never leave them outside overnight. A light smear of oil before winter storage will keep rust at bay until spring. If you have several pairs, keep a sharp one for pruning and an older pair for cutting roots or gritty soil, so the good blade stays good.

Look after your secateurs and they will look after your plants. Clean cuts heal faster, disease has fewer doorways, and your wrists will thank you at the end of a long afternoon on the plot.