How to Trim a Hedge Straight (Without a Sore Back)

Most people cut a hedge from the top down, working along it in one pass, and end up with a slow wave running the length of it. The hedge isn't the problem. The order of operations is.

Cut the sides first, then the top

This is the one change that fixes most crooked hedges. Do the vertical faces before the flat top. Two reasons: the sides give you a clean reference edge to level the top against, and the clippings fall away instead of sitting on the surface you're about to cut.

Work from the bottom of each face upward, sweeping the blade in a slow arc. Going upward means the cut material falls clear of the blade instead of getting dragged along it.

Taper the sides slightly inward at the top

A hedge with perfectly vertical sides will thin out and go bare at the bottom within a couple of seasons, because the top shades the lower growth. Angle each face so the hedge is very slightly wider at the base than at the crown — somewhere around a 10 degree lean is plenty. Sunlight reaches the bottom, the bottom stays green.

The string line trick, and when to skip it

For anything longer than about eight feet, run a string between two stakes at the height you want and cut to it. It feels fussy for the first two minutes and then saves you an hour of stepping back and squinting.

For shorter runs, use a fixed background instead — a fence rail, a windowsill, the roofline. Line the blade up against it and your eye will keep you straighter than guesswork will.

Keep the blade flat, and stop reaching

The most common cause of a scalloped top is tilting the tool as you extend your arms. Your reach changes the blade angle without you noticing. Cut only the section directly in front of you, then move your feet. Every time.

This is also where a rotating cutting head earns its keep — being able to turn the blade rather than your wrists means you can cut a vertical face with your arms in a natural position instead of twisting to keep the blade square.

When to trim

For most common hedging plants, late spring after the first flush of growth, and again in late summer, gives you a dense hedge that holds its shape. Trimming late in the season can push out soft new growth that gets damaged by the first hard frost.

One important thing: check for nesting birds before you start. In many places it's illegal to disturb an active nest, and in most of the US that means being careful through spring and early summer. Look properly, not just a glance.

Safety, briefly

• Eye protection every time. Hedge clippings come back at your face, not away from it.
• Gloves with grip, not gardening gloves.
• Both hands on the tool, always. If you need a hand to steady yourself, stop and move your feet instead.
• Never trim above shoulder height while standing on a ladder. If you can't reach it standing on the ground, that's a job for a pole trimmer.
• Check inside the hedge for wire, old fence posts and cane supports before the blade finds them for you.

The tool matters less than you think, except in two ways

Technique does most of the work. But two things genuinely change the result: weight, because a tool that tires your arms produces wobbly lines by the end of the hedge, and reach, because stretching is what tilts the blade.

That's the thinking behind the YardEdge Pro Cordless Hedge Trimmer — a 180 degree rotating head so you can cut vertical faces without twisting your wrists, dual-action blades that cut cleaner with less vibration through the handles, and two 21V batteries in the box so you finish the whole hedge in one session instead of stopping to charge. No cord to drag along the row, no gas engine to start.

Free US shipping, a 30-day money-back guarantee and a 12-month warranty.

Cut the sides first. Taper the top in. Move your feet. That's most of it.