Sharpening
Sharpening the cutting edges of garden tools
Updated 2026-05-20
A sharp tool cuts; a dull one tears. On living plants the difference is more than convenience — a clean cut closes faster and gives fungal spores less of a wound to enter. Each tool type has its own edge, so the method changes with the blade.
Know the bevel before you start
Most garden cutting tools have a single bevel: one face is ground at an angle, the other stays flat. The rule is to sharpen the bevelled side and never round over the flat side. Bypass secateurs cut like scissors with one sharpened blade; anvil pruners crush onto a flat bar and need the single top blade kept keen.
Match the angle that is already there
Tools leave the factory with a set bevel angle, often around twenty degrees. Following that existing angle keeps the edge strong; a shallower angle is sharper but chips, a steeper one is durable but dull.
Secateurs and loppers
Clean the blade
Sap and dried residue blunt the feel of the edge. Wipe the blade with alcohol so you can see the bevel clearly.
Work the bevel
Run a flat diamond file or a sharpening stone along the bevelled face only, in one direction, matching the original angle. A few firm passes are usually enough.
Remove the burr
A thin curl of metal forms on the flat side. Lay the stone flat against that side and make one light pass to take it off without adding a second bevel.
Oil and test
Wipe on a drop of oil and cut a sheet of paper. A clean slice means the edge is ready.
Shears, loppers, and larger blades
Hedge shears and lopper blades follow the same single-bevel logic but over a longer edge. Clamp or brace the tool so it stays still, then draw the file along the whole bevel in consistent strokes. Keep the pressure even from heel to tip so the edge does not develop flat spots.
Spades and hoes have edges too
A digging spade or a hoe is a cutting tool against soil and roots. A file run across the leading edge at a shallow bevel turns hard work into easy slices through turf. These edges are coarse by design, so a single-cut mill file is enough — no fine stone needed.
Always sharpen a clean tool — see cleaning and removing rust first. A freshly sharpened edge also rusts fastest, so protect it before winter storage. General horticultural guidance is published by the Royal Horticultural Society.