Logo

Why a Clean Cut Matters More Than You Might Think

A clean cut is one of the kindest things you can do for a plant. When a shear or lopper is sharp, it severs the tissue in a single, decisive stroke, leaving a smooth face that seals over quickly and keeps infection at bay. A blunt tool does something rather different: it crushes and tears, leaving a ragged, bruised wound with fibres hanging and bark stripped back from the wood. That damage is an open door for problems we know all too well in the British climate — silver leaf on plums and cherries, coral spot on weakened wood, dieback on roses and fruit trees, and fungal spores that thrive in damp, cool air.

There is a practical side to this as well. A well-maintained pair of shears is easier on your wrists and hands, and it lasts for decades rather than seasons. Most of the tools that fail in the shed haven't worn out — they've been neglected. Give them twenty minutes of care a few times a year and you'll notice the difference in both your plants and your pruning.

Know Your Blades Before You Touch Them

Before sharpening anything, it pays to know what you're working with. Bypass shears and loppers cut like scissors, with a sharp curved blade passing a flat, blunt one. The sharp blade carries a single bevel on the outer face; the flat blade — often called the counter blade or hook — should never be sharpened into a keen edge, as the two need to slide past one another cleanly. Anvil types work differently, bringing a straight blade down onto a soft metal or plastic bed, and their cutting angle is steeper, roughly 45 degrees.

Look also for wavy or serrated edges on some specialist tools. These are almost impossible to sharpen by hand and are best left alone or sent for professional attention. Once you know the angle and which side takes the bevel, everything else falls into place.

Cleaning: The Five-Minute Habit That Saves Hours

Sap is the quiet enemy of every cutting tool. It sets like glue, drags on the blade, and holds moisture against the steel. Get into the habit of wiping your blades down at the end of every session, not just at the end of the season.

• Wipe sap and green residue from both blades with an oily rag or a little wire wool.
• Use warm soapy water on stubborn resin — particularly after pruning conifers, yew or holly — then dry thoroughly. Never leave tools to soak.
• Dissolve sticky build-up with a drop of methylated spirits or white spirit on a cloth.
• Clean sap from the pivot and spring area with an old toothbrush, where grit and dust collect unnoticed.
• Wipe the whole tool with a light film of camellia oil or a few drops of machine oil to keep rust at bay.
• Between plants — especially roses, box and fruit trees — wipe blades with methylated spirits to avoid passing problems from one specimen to the next.

Sharpening Shears and Loppers Properly

Sharpen little and often rather than aggressively once a year. A fine-cut file or a diamond paddle file is ideal; a small round file is handy for the curved blade of bypass loppers.

Follow the existing bevel — usually between 20 and 25 degrees on bypass tools. Work in smooth strokes from the base of the blade towards the tip, keeping the file flat against the bevel and lifting it on the return stroke so you don't blunt the edge you've just made. Five to ten passes on each side of the bevel is usually plenty for a touch-up. Finish with a few strokes of a fine sharpening stone or diamond stone to polish the edge and remove the burr.

Turn the blade over and lay it flat on a fine stone to take off any burr that has curled onto the flat face. Do not file the flat face itself. Never use a bench grinder: the heat it generates will draw the temper from the steel and leave you with a blade that won't hold an edge.

To test, cut a sheet of newspaper or kitchen paper. A properly sharp shear will slice through it cleanly without folding or snagging.

Adjusting Tension and Replacing Worn Parts

A sharp blade won't cut well if the pivot is slack. Most shears and loppers have a nut and bolt at the pivot, and a small adjustment here can transform the feel of the tool. Tighten until the blades meet with slight, even resistance along their whole length, then back off a fraction so the action stays smooth. On some models the nut has a left-hand thread, so check before applying force.

While you're there, check the spring, the buffer or bumper that cushions the closing action, and any locking catch. These are inexpensive to replace and usually available as spare parts. Worn buffers let the blades clash, which chips the edge you've just honed. A drop of oil on the pivot every few weeks keeps everything moving freely.

Storage and the Seasonal Overhaul

Our damp climate is hard on steel, so where you keep your tools matters. Hang shears and loppers on a peg in a dry shed or garage rather than leaving them on a concrete floor, where condensation forms and rust takes hold. A canvas tool roll or a hook on the wall is ideal.

Autumn, once the main pruning season has passed, is the perfect moment for a thorough overhaul: strip the tool down if it comes apart easily, clean every part, sharpen the bevel, oil the pivot, replace the buffer and spring, and give the metal a protective film. Do the same quick check in spring before the growing season begins.

Look after your shears and loppers and they will repay you for years — with cleaner cuts, healthier plants, and a quiet satisfaction every time the blades close with that crisp, unmistakable snap.