How to Trim a Hedge Straight
Use a string line to cut hedge tops and sides level. A straightforward way to keep formal hedges looking sharp and tidy.
Quick answer
Tie a string line between stakes to set the height and width. Spread a sheet to catch clippings. Trim the top first, then the sides, following the guides. Step back often to check for straightness. Sweep up when done.
Straight hedge edges give a garden a crisp, formal look. A simple string line removes guesswork and helps you cut an even line every time.
What you’ll need
- hedge shears or electric trimmer
- long string line and stakes
- garden broom
- rake
- gloves
- sheet or tarp
Step by step
- 1
Set up guides
Push stakes into the ground at both ends of the hedge. Tie a string line between them at the height and width you want. Check it is level with a spirit level or by eye.
- 2
Lay a sheet
Spread a sheet or tarp on both sides of the hedge. This catches clippings and saves raking later.
- 3
Cut the top
Start at one end. Cut along the string line, taking off small amounts at a time. Step back every few metres to check the line is straight. Do not overreach.
- 4
Cut the sides
Use a second vertical string line if the hedge is wide. Trim from bottom to top so falling clippings do not hide untrimmed growth. Keep the blade parallel to the hedge face.
- 5
Tidy up
Rake clippings from the sheet into a barrow. Sweep the pavement or lawn. Check the hedge for any stray branches and snip them.
Electric trimmers and shears can cause serious cuts. Keep the cable over your shoulder and away from the blade. Wear gloves and eye protection. Do not use electric tools in wet conditions. Check for nesting birds before cutting; it is illegal to disturb active nests in many regions.
Common mistakes
- Cutting too deep in one pass. Remove small amounts. You cannot put branches back.
- Trimming without guides. Freehand cutting rarely gives a straight finish.
- Ignoring nesting birds. Check the hedge for birds between March and August before you start.
- Trimming wet hedges with electric tools. Water and electricity are a dangerous mix. Wait for dry weather.
Frequently asked
When is the best time to trim a hedge?
Trim formal hedges in late spring and again in late summer. Avoid cutting in freezing weather or during active bird nesting season.
How do I fix a hedge that is wider at the top?
Cut the top back harder than the sides so the face slopes slightly inward. This lets light reach the lower branches and prevents bare legs.
Questions about this guide
No questions yet — be the first to ask one and we’ll help you out.
Comments
No comments yet. Start the conversation.
Did this guide help?
Did you try this?
Help others by sharing how it went.
Show your result
Tried this guide? Share a photo of how it turned out.