Tools & Gear · Buying guide
Bypass vs. Anvil Pruners and Loppers: Which to Use
Bypass pruners cut like scissors and suit live stems. Anvil pruners press a blade onto a flat plate and suit dead wood. Here is how to choose, with size limits.
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Bypass vs. Anvil Pruners: The Short Answer
Buy bypass pruners for live wood and anvil pruners for dead wood. A bypass pruner has a sharpened blade that slides past a curved lower jaw like a pair of scissors, so it slices a green stem cleanly. An anvil pruner has a sharpened blade that closes onto a flat plate, which works well on dry, dead branches and is more likely to crush living ones. If you own a single pair, make it bypass. Both styles handle stems up to about 3/4 inch in diameter, and the same rule carries over to loppers for branches up to 1 1/2 inches.
| Bypass | Anvil | |
|---|---|---|
| How it cuts | Blade passes a curved jaw, scissor action | Blade closes onto a flat plate |
| Best on | Live, green stems and branches | Dead, dry branches |
| Cut quality | Close and clean when sharp | Cannot cut as close; may crush stems |
| Weak point | Can jam or twist on hard dead wood | Bruises live tissue |
| Blade bevel | One side only | Both sides |
| Hand pruner size limit | About 3/4 inch | About 3/4 inch |
| Lopper size limit | About 1 1/2 inches | About 1 1/2 inches |
What Are Bypass Pruners?
Bypass pruners, also sold as bypass pruning shears or secateurs, have two parts that overlap as the handles close. The upper blade is sharpened. The lower jaw is thicker, curved and unsharpened, and it holds the stem while the blade slides past it. Iowa State University Extension describes this as a scissor action and notes that sharp, properly used bypass pruners make close, clean cuts.
That close cut is the reason they are the standard tool for living plants. The narrow, curved head fits into tight branch angles, so you can cut just above a bud or flush to a branch collar without leaving a stub. North Carolina State Extension calls bypass shears by far the most commonly used hand pruners. University of Maryland Extension is more direct, rating bypass pruners superior to anvil pruners because they reduce tearing and crushing of plant tissue.
The trade-off shows up on old, hard, dead wood. A dry branch can wedge between the blade and the jaw and jam the tool, which is the one job where Iowa State gives the anvil type the edge. When a bypass pruner stalls on a dead stem, move up to a lopper or switch to an anvil before you reach for more force.
What Are Anvil Pruners?
An anvil pruner has a single straight blade, sharpened on both sides, that comes down onto a flat surface called the anvil. The action is closer to a knife on a cutting board than to scissors. The blade drives through the stem and stops against the plate.
Iowa State lists the strengths plainly: anvil pruners are effective at pruning dead branches and are less likely to jam than bypass pruners. The same guide lists the limits. Anvil types cannot cut as close as scissor types, because the wide plate sits between the blade and the plant, and they are more likely to crush stems. On dead wood neither limit matters, since there is no living tissue to bruise and no bud to cut close to.
Two design variations are worth knowing. Some newer anvil pruners use a curved anvil and blade in place of the flat style, which North Carolina State Extension says gives a much cleaner cut. Ratchet pruners, often built on an anvil head, add a mechanism that latches as you squeeze so you can release and squeeze again. Each squeeze clicks to the next setting and applies more pressure, so the cut happens in stages with less hand strain. That makes a ratchet model a reasonable pick for a gardener with a weak grip or arthritis.
Bypass or Anvil: Which One Should You Buy?
Start with what you cut most. Roses, hydrangeas, blueberries, fruit tree shoots, tomato suckers and perennials are all live tissue, and all of them call for a bypass pruner. If that list covers your garden, one good bypass pruner is enough for stems up to 3/4 inch.
Add an anvil pruner when dead wood is a regular job: clearing winterkilled canes, cutting back dry perennial stalks in late winter, or chopping brush into short lengths for the bin. Those cuts are hard on a bypass blade and easy for an anvil.
A few checks apply to either style. The tool should open and close fully in your hand without a shift in grip. You should never have to squeeze hard; North Carolina State Extension treats a tight squeeze as the sign that the stem is too big for the tool. Check whether replacement blades and springs are sold for the model, since those are the parts that wear. For fit, handle shape and left-handed models, see how to choose pruning shears.
Bypass vs. Anvil Loppers
Loppers are long-handled pruners worked with both hands, and they come in the same two types. Extension guidance does not change with the handle length: Iowa State notes that bypass loppers are usually preferred for all the same reasons as bypass hand pruners. A bypass lopper is the tool for thinning a lilac, taking out old blueberry canes or removing a crossing branch on a young apple tree. An anvil lopper suits dead limbs and cleanup after a storm.
Size limits depend on the tool more than the blade style. Hand pruners are generally used on branches up to 3/4 inch in diameter, and North Carolina State sets a more cautious limit of 1/2 inch for small shears. Loppers cut branches from about 3/4 inch to 1 1/2 inches. Their handles run from about 20 to 40 inches long, and the longer the handle, the more leverage and reach you get. For anything larger than 1 3/4 inches, Iowa State recommends a pruning saw. Between 1 1/2 and 1 3/4 inches, use a saw if the lopper needs force.
Treat these figures as working limits even when the jaws open wider. The North Carolina State rule applies to loppers as well: if a 1 1/4 inch branch takes a hard squeeze, it is too big for that tool, and stepping up to the saw leaves a cleaner cut.
Keeping Either Type Sharp and Clean
A dull bypass pruner crushes stems as badly as an anvil, so maintenance decides cut quality more than the mechanism does. After each session, wash off sap with soap and water, dry the tool, and leave a light coat of oil on the blade, bolt and spring.
Sharpen along the bevel that the factory ground. University of Minnesota Extension gives the natural bevel angle as 10 to 20 degrees and advises stroking in one direction only, never back and forth. Bypass blades are beveled on one side, so sharpen that side and leave the flat face alone. Anvil blades are beveled on both sides and need equal strokes on each. A file, a diamond sharpener or a whetstone will all do the job. The full method is in how to sharpen garden pruners and loppers.
When you are cutting out diseased wood, disinfect the blades between cuts. University of Maryland Extension recommends 70 percent alcohol, or bleach diluted one to nine with water. Rinse bleach off afterward, because it corrodes metal. Wipe the blades dry and oil them again when you finish. Most of this work falls in the dormant season, and the late winter pruning guide covers which plants to cut then.
Quick recap
- Bypass pruners cut with a scissor action and are the default for live stems.
- Anvil pruners close a blade onto a flat plate and are best kept for dead, dry wood.
- Hand pruners of either type handle branches up to about 3/4 inch; loppers handle 3/4 inch to 1 1/2 inches; use a saw above 1 3/4 inches.
- The same bypass and anvil rule applies to loppers, which have handles 20 to 40 inches long.
- Sharpen at the existing 10 to 20 degree bevel, and disinfect with 70 percent alcohol when disease is present.
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Frequently asked questions
What are bypass pruners?
Bypass pruners are hand shears with one sharpened blade that slides past a curved lower jaw, the way scissor blades pass each other. They make close, clean cuts on live stems up to about 3/4 inch thick.
What is a bypass lopper?
A bypass lopper is a two-handed pruner with the same scissor action as a bypass hand pruner and handles roughly 20 to 40 inches long. It cuts live branches from about 3/4 inch to 1 1/2 inches in diameter.
Is an anvil or bypass pruner better?
For most gardens, bypass. University extension guides prefer bypass pruners because they cut closer and are less likely to crush stems. Anvil pruners are useful as a second tool for dead branches.
Should I get anvil loppers or bypass loppers?
Choose bypass loppers if you prune living shrubs and fruit trees. Anvil loppers make sense when most of the work is dead wood, since they are less likely to jam on dry branches.
Can I use anvil pruners on live branches?
You can, but the blade presses the stem against a flat plate and is more likely to crush it, and the tool cannot cut as close to a bud or branch collar as a bypass pruner.