There is a particular sound a blunt pair of secateurs makes on a woody stem: a dull, fibrous crunch followed by a small tug as you force the cut. A sharp pair makes almost no sound at all — just a clean snick. That difference matters far more than most gardeners realise. A crushed stem is an open wound. Its tissue is bruised, its cambium is torn, and it dries back further than it should, which is exactly the sort of invitation that fungi and dieback take advantage of.
Sharp blades pay you back all season. You cut faster, your wrist aches less, and plants recover more quickly because the wound is small and clean. By late summer, when the asters are beginning to open and the copper-leaved shrubs are at their best, you want to be deadheading and tidying without wrestling the tool every few minutes.
You do not need an elaborate kit. A small, tidy collection kept together saves rummaging through the shed in November.
Bypass secateurs have one bevelled blade and one flat, hook-shaped blade. This is important: you sharpen only the bevelled edge, on the outward-facing side. The flat blade must stay flat — if you file it, the two halves will no longer meet and the tool will simply fold stems instead of cutting them.
Clean the blade first with an oily rag and the wire brush. Dried sap blunts a file as quickly as it blunts the blade. Then hold the secateurs so the bevelled edge faces you, and file from the base of the blade towards the tip, using long, smooth strokes rather than short scrubbing ones.
Anvil secateurs are different: the blade meets a soft metal anvil, and you sharpen the flat side of the blade rather than the bevel. Follow the manufacturer's angle, and replace the anvil if it has become deeply scored.
The pivot is the part everyone forgets, and it is the part that makes the difference between a tool that glides and a tool that sticks halfway through a cut. Put a single drop of light oil on the central bolt, work the handles open and shut a dozen times, then wipe away the excess.
Two warnings here. First, too much oil attracts grit, and grit is a grinding paste inside a pivot. One drop, worked in, is right. Second, check the central nut while you are there. If there is daylight between the blades at the tips, tighten it a quarter turn with the spanner until they close with a whisper of contact along their whole length. Check the spring, too — if it has lost its tension, the blades will not open cleanly and you will find yourself using two hands on every cut.
Your sharpening routine should follow the garden. In late summer, when the Michaelmas daisies are budding up, a sharp pair lets you deadhead flower after flower cleanly, and the plants respond by pushing more buds from the sides. Cut back to just above a leaf pair, leaving a short stem rather than snipping into the crown.
Autumn is when the copper-toned foliage really earns its place. Cotinus, Physocarpus and the warm-leaved heucheras glow against the blue and pink of the asters, and a neat cut on a stray shoot keeps that picture crisp rather than ragged. Take out any damaged or crossing stems cleanly at the base — a bruised cut on a shrub like this often means dieback by spring.
Late winter is your main sharpening session. Before you cut back the asters to 10 to 15cm and prune the copper-leaved shrubs for their fresh flush of growth, strip the secateurs down, clean them, sharpen them properly and oil them. Then clean the blades again between plants if you have seen rust or mildew, which asters are prone to in a damp autumn.
Eventually every blade reaches a point where the bevel has been filed back so far that the two halves no longer meet properly, or where a chip sits too deep to remove without ruining the profile. If you find yourself filing for ten minutes every week, the tool is telling you something. A decent pair of secateurs will last many years with this simple routine — a blunt one costs you time, plant health and, eventually, a great deal of annoyance on a cold November morning.
Copper Aster shares practical, down-to-earth guidance on practical uk gardening with aster flowers, copper-toned foliage, and seasonal border care. for readers across the UK.
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