How to Cut a Hedge | Clean Lines That Last All Season

A neat hedge comes from cutting the sides first from the bottom up, keeping the top narrower than the base, and using a taut string line as your straight-edge guide.

A hedge that’s trimmed the right way looks full from ground to tip, stays healthy, and needs less frequent touch-ups. The core trick most people skip: start at the bottom and work upward, so falling clippings don’t block your view of the uncut section above. Walk the hedge’s full length first, note where growth is uneven, and lay a clean tarp beneath the work area before you make the first cut.

Set a Guide Line for a Straight Top Edge

A string line is what separates a professional-looking hedge from one that wanders. Drive two stakes or posts into the ground at each end of the hedge — never tie the string to the hedge itself, because foliage shifts and drops as you cut. For especially long hedges, check the line’s level every few yards with a simple string level before cutting.

The Right Cutting Order: Sides First, Bottom Up

Always trim the sides before the top. Starting at the base, use an upward sweeping motion with powered trimmers so blades cut cleanly. Keep the trimmer blades parallel to the hedge side and work in overlapping passes. The critical shape rule: taper the hedge so the top is slightly narrower than the base — this allows sunlight to reach the lower branches, keeping them from going bare and patchy. After one full side, step back and check symmetry before doing the other side.

Finish the Top and Clean Up Properly

Once both sides are shaped, use your taut string line as a guide and cut the top in a controlled horizontal pass. Step back often during this step; a slight dip or rise is obvious from five feet away but invisible from arm’s length.

When the cutting is done, rake or sweep every clipping off the hedge surface and off the tarp. Clippings left on the hedge block light from reaching the cut stems, which slows regrowth and can trap moisture against wounds. Bag the trimmings for green-waste collection or add them to a compost pile in thin layers.

If you’re ready to upgrade your gear for next season or replace a tired trimmer, our roundup of the best hedge cutters covers corded, cordless, and gas models tested on real hedges.

Common Mistakes That Ruin a Hedge Trim

• Cutting top-down. Starting at the top lets clippings fall across uncut lower sections, so you can’t see where the next pass should land.
• Skipping the guide line. Freehand tops drift by an inch or more by the far end — the string line is the only way to guarantee a level cut across the whole hedge.
• Leaving the top as wide as the base. This shades the lower growth, and the hedge goes thin and woody at the bottom within a year.
• Removing too much at once. Mild, overcast days reduce plant stress.