How do I cut back a badly overgrown hedge?
The one-side-a-year method that lets a hedge recover, which species tolerate hard cutting and which are killed by it, and how to rebuild the taper as it regrows.
- Difficulty
- intermediate
- Time
- 8 hr
- Read
- 5 min
- Safety
- warning
Short answer
Cut one side hard back to the main stems in late winter, leave the other side and the top intact for a full year so the hedge can feed itself, then do the second side the following winter. Beech, hornbeam, yew, privet, hawthorn and laurel take this. Leylandii, Lawson cypress and Thuja will not regrow from brown wood and cannot be renovated this way.
Hard renovation removes most of a plant's leaf area, and leaves are how a plant funds regrowth. Taking both sides and the top in one go leaves nothing to power the recovery, which is why so many renovated hedges sulk for three years or die. Doing one side at a time is slower on paper and much faster in practice.
Safety
What you'll need
- Loppers and a pruning saw
- Bow saw (optional)
- Eye protection, gloves and stout boots
- Platform tower for height (optional)
- String line and canes
Step by step
- Identify the species first, because it decides everything.Yew, beech, hornbeam, hawthorn, blackthorn, privet, box, holly, laurel and escallonia all regenerate from old wood. Leylandii, Lawson cypress, Thuja and most other conifers except yew do not — cut into brown wood and it stays brown permanently.
- Check for nesting birds, and check for protections.A thorough physical check of the hedge, whatever the month. If the hedge contains a tree or sits in a Conservation Area, ring the council before you cut anything.
- Choose late winter for deciduous, mid-spring for evergreen.Deciduous hedges renovate best in the dormant period, roughly January to early March, before growth starts and before nesting. Evergreens including yew are better in mid-spring, around April to May, when they can respond quickly. Neither should be done in autumn.
- Feed and mulch the hedge the season before, if you can plan ahead.A hedge about to lose most of its leaves recovers far better from good reserves. A general fertiliser in spring and a mulch of compost along the base, kept off the stems, is worth doing the year before.
- Do one side only, right back to the main stems.Cut that face back to within 150mm or so of the central stems, or to whatever line you eventually want plus an allowance. It will look brutal and skeletal. Leave the other side and the top untouched.
- Reduce the top only when you take the second side.Taking the height at the same time as a side removes too much. If height reduction is the main aim, plan it into the second year, cutting to slightly below the final height so regrowth fills it in.
- Cut cleanly and slope the cuts.Saw cuts, not torn or crushed ones. Sloping the cut face slightly means water runs off rather than sitting on the stub.
- Feed, mulch and water through the recovery year.Spring feed, a thick mulch along the base kept clear of the stems, and water in dry spells. This is the year the hedge is rebuilding and it makes a visible difference.
- Do the second side twelve months later.Once the first side has broken into good new growth. On a very old or weak hedge, wait two years rather than one.
- Rebuild the taper as it regrows.As the new growth comes, trim it to a batter — wider at the base, narrower at the top — so light reaches the bottom permanently. This is the moment to fix the shape that let the hedge go bare underneath in the first place.
- Deal with the arisings correctly.Chip or compost woody material if you can, take it to a green waste facility if not. Never burn near a house or in a dry spell, and if there is any Japanese knotweed or other invasive growth in the hedge, that material must go to a licensed facility and never in a compost heap or green bin.
Tips
- Photograph the hedge before you start and again each year. Recovery is slow enough that you will not believe the progress without the photographs.
- If the hedge is on a boundary, tell the neighbour before you start. A hedge that looks destroyed for a year is a conversation much better had in advance.
- Marking the intended line with canes and string before cutting stops the very common problem of taking more off the middle than the ends.
Common mistakes
- Cutting both sides and the top in one season — The plant loses nearly all its leaf area at once and has nothing left to fund regrowth. Even species that tolerate hard pruning sulk for years after this.
- Renovating a leylandii by cutting into brown wood — It will not regenerate. You are left with a permanent brown scar, and the only remedy is removal and replanting.
- Renovating in autumn — The hedge cannot regrow before winter, so cut surfaces sit exposed through the wet and cold months with no cover.
- Not feeding or watering afterwards — Renovation is a large demand on a plant. Support it for two seasons and the recovery is roughly twice as fast.
If it doesn't work
No regrowth after a hard cut
Cause: Species that does not shoot from old wood, or the plant was too weak — Fix: If it is a conifer other than yew, it will not come back. Replace that section. If it is a broadleaf, feed, mulch, water and give it a full second season before deciding.
Regrowth only at the top
Cause: Light not reaching the lower stems — Fix: Reduce the height and cut a proper batter so the base gets light. Take it in stages.
Hedge died back the year after renovation
Cause: Too much removed at once, or drought stress in the recovery year — Fix: Water and feed generously. Where sections have died, plant young replacements into the gaps and train them in.
Gaps at the base that never fill
Cause: Old bare stems with no buds left — Fix: Plant new young plants into the gaps, improve the soil first, and keep them watered — they are competing with an established root system.
Questions people ask
How far back can I cut?
On species that regenerate from old wood, back to the main stems — beech and yew can be cut almost to a framework of trunks and will come back. On conifers other than yew, no further than the green growth, because brown wood does not reshoot.
Can I do it all in one go if I am replanting anyway?
If you are prepared to lose the hedge, yes. But if the aim is to keep it, the one-side-a-year method has a far higher success rate and only costs an extra twelve months.
What if it is a shared boundary hedge?
You may cut growth on your side back to the boundary, but the hedge itself may be jointly owned or entirely the neighbour's. Renovation is a big enough intervention that it needs a conversation and, ideally, agreement first.