What are bypass pruning shears?
Bypass pruning shears are hand pruners whose sharp, curved blade sweeps past a fixed, hooked jaw to cut a stem cleanly, in the same way the two blades of a pair of scissors pass each other. That slicing action leaves a smooth, close cut on living stems that seals quickly, which is why bypass shears are the default choice for most pruning.
The name describes the mechanism: the blade bypasses the jaw rather than closing onto it. Only the blade is sharpened; the hooked jaw simply holds and supports the stem while the blade slices through. Quality bypass secateurs from Felco, Corona, and ARS re-sharpen and rebuild, so a single pair can last for many years.
How do bypass shears differ from anvil shears?
Bypass shears slice, while anvil shears crush. An anvil pruner closes its blade onto a flat plate, splitting stiff, dead wood with less effort but bruising live tissue. A bypass pruner passes its blade by a hooked jaw, giving a cleaner cut on green stems. The full trade-off is covered in our anvil versus bypass pruning shears guide.
Because most gardening is cutting living plants, bypass shears handle the majority of jobs, and many gardeners add an anvil pruner only for dead, dry stems.
What are bypass pruning shears best for?
Bypass shears are best for cutting live, green stems up to about ¾ inch: roses, shrubs, perennials, and soft new growth. Their slim head reaches into tight, crowded growth, and the clean cut helps the plant heal. Keep them off hard deadwood, which can twist a fine bypass blade, and move to loppers or a pruning saw for thicker branches. To choose a pair, see our best hand pruners roundup.
How do bypass pruning shears work?
Bypass pruning shears work by driving a sharp, curved blade past a fixed, hooked counter-jaw, so the two edges pass each other like the blades of a pair of scissors and shear the stem cleanly between them. Only the curved blade is sharpened; the hooked jaw grips and supports the stem while the blade slices through.
A return spring reopens the handles after each cut, so your hand only has to close them, and a safety catch locks the blades shut for storage. Because the blade passes so close to the jaw, the cut stays clean only while the two remain in alignment — a bent blade or a loose pivot lets the stem slip and tear rather than sever. Keeping the pivot correctly tensioned and the blade true is therefore central to how well the tool cuts, which is one reason rebuildable models with an adjustable pivot outperform riveted ones over time.
What size stems can bypass pruning shears cut?
Bypass pruning shears cut living stems up to about ¾ inch (roughly 20 mm) on most models, with some larger tools rated close to an inch. Cutting near the top of that range repeatedly wears the tool and tires your hand, so staying below the limit gives cleaner cuts and a longer-lasting blade.
Capacity is set by the size and geometry of the head, not by how hard you squeeze, and forcing a stem thicker than the rating springs the blade out of alignment. Seat the stem deep in the jaws near the pivot, where leverage is greatest, and a cut that stalls at the tip will often close easily. When a stem is genuinely too thick — dead or alive — move up to loppers for wood approaching an inch, or a pruning saw for anything larger, rather than straining the fine bypass blade.
How do you keep bypass shears cutting cleanly?
Keep bypass shears cutting cleanly by honing the single blade whenever the cut turns ragged, wiping sap off after each use, and keeping the pivot correctly tensioned so the blade passes the jaw closely. A keen, true blade is what gives the clean, healing cut bypass shears are chosen for.
Sap and a blunt edge are the two things that spoil the cut: sap gums the action and dulls the blade, while a blunt edge crushes instead of slicing. A quick wipe and an occasional touch-up with the right sharpening files and tools prevent both. On a quality tool a worn blade unbolts and a fresh one goes on, so the pruner need never be scrapped. To pick a pair that rebuilds this way, see our best hand pruners roundup.
