Sharpening And Caring For Pruning Tools

Why Clean Cuts Matter More Than You Think

A pair of sharp secateurs is one of the kindest gifts you can give your garden. Every time you prune, you open a wound in living tissue, and the plant has to seal that wound with its own defences. A clean, angled cut made by a honed blade closes quickly; a ragged, crushed cut made by a blunt one leaves torn bark and bruised wood that weep sap and invite infection. In damp British winters, when fungal spores are everywhere and air circulation is poor, that difference can decide whether a shrub shrugs off a trim or spends spring fighting dieback.

Think about what you are cutting and when. A vigorous Cornus alba stooled hard in late winter will bounce back from almost anything, but an evergreen such as Euonymus fortunei or a slow-growing shrub like Skimmia deserves a blade sharp enough to slice rather than crush. If you are pruning anything in the Prunus family, silver leaf is the risk, so work on a dry day in late spring or summer with tools you have cleaned since their last job.

Cleaning Down After Every Session

Plant sap is sticky, corrosive and full of pathogens waiting for a lift to the next host. Give your tools ten minutes at the end of each pruning session and they will last decades rather than seasons.

• Wipe blades with a cloth soaked in methylated spirits or a diluted household disinfectant, working from the spine to the tip.
• Scrub dried sap off with a wire wool pad or a fine brass brush, paying attention to the recess where the blade meets the anvil.
• Dry thoroughly — steel rusts fastest in a shed that stays cold and damp.
• If you have been working on a diseased plant, such as a rose with blackspot or a shrub with coral spot, disinfect between every shrub, not just at the end.

A little oil afterwards goes a long way. A drop of camellia oil or light machine oil on the pivot, spring and locking catch keeps everything moving freely and pushes moisture away from the metal. Never use cooking oil, which turns gummy and traps grit.

Sharpening Secateurs, Loppers and Shears

By the end of a busy summer your bypass secateurs will have made tens of thousands of cuts. Sharpen them little and often rather than waiting until they chew through stems.

Take the tool apart if the maker intended it to come apart, or hold it open and steady on a workbench. Use a diamond file or a fine sharpening stone, and match the existing bevel angle — usually around 20 to 25 degrees. Strokes should run in one direction along the bevel only, never across the flat back of the blade. Five or six passes on each side of a curved blade, following the curve, is normally plenty. Finish by drawing the blade lightly across a fine stone to remove the burr you have raised, then wipe clean.

• Anvil secateurs and loppers are sharpened on the flat blade side only; the anvil is meant to be soft and replaceable.
• Hedge shears benefit from a few strokes along the full length of each blade, keeping the bevel consistent.
• Replace worn springs, rubber buffers and blade screws rather than fighting on with a tool that no longer closes properly.
• Test the edge on a sheet of newspaper; a truly sharp blade will slice cleanly rather than tear.

Seasonal Timing for Tool Care

Gardeners work to a rhythm, and so should their tool maintenance. In late winter, before the sap rises, give everything a full service: strip, clean, sharpen, oil and reassemble. This is when you will be cutting back winter-flowering shrubs, deciduous hedges and any storm damage, and you want the best edge you own.

Spring is for light touch-ups. A quick sharpen before you tackle box, privet or an overgrown rose will save your wrists. Carry a small diamond file in your pocket and use it whenever you notice a cut that bruises rather than slices.

Summer brings heavy use on hedges, deadheading and shaping evergreens such as Buxus and Ilex. Clean frequently and keep a spare pair of secateurs on the bench so a blunt blade never tempts you to force a cut.

Autumn and early winter are for tidying, lifting and the last structural pruning before hard frosts. After that, clean and oil everything and hang it dry, blades closed, off a damp floor. Tools stored damp in a cold shed will be pitted with rust by February.

Working Around Frost And Native Wildlife

Sharp tools let you prune at the right moment rather than the convenient one. Avoid cutting evergreens and tender shrubs when the wood is frozen — shattered cells heal badly — and leave structural pruning of frost-tender plants like Pittosporum or Choisya until the risk of hard frost has passed, usually mid-spring in most of the UK.

Clean, quiet, precise cuts also protect the creatures sharing your garden. Hibernating hedgehogs, queen bumblebees and overwintering ladybirds tuck into leaf litter, log piles and the base of dense shrubs, so check before you cut. Leave seedheads on teasels, sunflowers and Echinacea through winter for goldfinches, and resist the urge to tidy every stem — hollow ones are prime solitary bee nurseries.

Vulnerable native species such as hazel, hawthorn and field maple respond well to careful, well-timed pruning with sharp blades, and they repay you with catkins, berries and nesting cover. Cutting them cleanly in the dormant season, before birds nest, keeps them healthy and keeps your garden working as part of the wider landscape.

A Small Routine That Pays You Back

Ten minutes of cleaning, five minutes of sharpening and a drop of oil now and then is all it takes. Keep a small kit together — a brass brush, a diamond file, an oil bottle and a rag — and store it with your tools so there is no excuse. Sharp, clean blades cut faster, tire you less and leave your plants healthier going into every season. Your secateurs will thank you, and so will the garden.