This is the most common large hedge problem there is, and the answer is decided by one thing you can check yourself in two minutes, before speaking to anybody. Reading this first will tell you whether the quotes you are about to collect are for something achievable.
The rule
The check
Push a hand into the hedge and find how far in the green goes before it turns brown. Do it on the top and on each face separately, because they give different answers.
| Green depth | What is realistic |
|---|---|
| 12in or more | Substantial reduction available |
| 6–12in | A useful reduction, especially on top |
| 3–6in | A modest trim rather than a reduction |
| Under 3in | Reduction not really available |
Why the top always has more green
Because that is where the light falls. A Leylandii hedge only produces foliage where light reaches, so the top carries a deep green shell while the faces — particularly a north-facing or shaded side — carry a shallower one.
The practical consequence is that height reduction is usually available even on a badly neglected hedge, while width reduction frequently is not. That is useful to know, because height is generally the complaint that gets people reaching for the phone.
How it got this way
Worth understanding, because it explains why the clock matters so much with this species.
Leylandii grows two to three feet a year unchecked. Each year it is not cut, the outer shell grows further out and shades the growth behind it, which dies back and turns brown. So the green shell stays roughly the same thickness while moving steadily outward, and the bare interior grows behind it.
The distance you can ever cut back to therefore shrinks every single year. That is the real argument for an annual cut — not tidiness, but preserving the option to make the hedge smaller later. It is an option you can lose permanently.
If there is enough green
- Take the height back to something you can maintain, ideally reachable from a step ladder.
- Take a little more than feels necessary — it grows between cuts.
- Do the faces at the same time, as far as the green allows.
- Establish a line and have it cut back to that line every year afterwards.
- Agree where the arisings go before the work starts — Leylandii is dense and heavy and there is more of it than you expect.
If there is not
- Live with it, cut annually within the green. The hedge stays roughly this size but stops getting worse.
- Take the height only. Usually still available, and it addresses the most common complaint.
- Accept a brown face temporarily. Some people do this on a boundary they do not look at, planting in front of it.
- Remove and replace. The clean answer where the hedge is simply too big for the garden.
If you replace it
| Replacement | Screening restored | Long-term |
|---|---|---|
| Laurel | 3–5 years | Fast and forgiving of hard cutting |
| Beech or hornbeam | 5–8 years | Far more manageable |
| Yew | 8–15 years | Best formal hedge; cuts back hard |
| Another conifer | 3–5 years | Same problem in twenty years |
| Fence | Immediate | Generally limited to 2m without permission |
The fence point catches people out and matters particularly in Redditch, where a lot of gardens back onto other housing. Under permitted development a boundary fence is generally limited to two metres, so it will not replace the screening a four-metre hedge was providing.
The neighbour's hedge
If the Leylandii belongs to a neighbour, you may cut growth that crosses the boundary onto your side, back to the line and no further. The cuttings technically belong to them.
But be careful. Cutting a conifer flush to the boundary very often means cutting into brown wood, and the permanently bare face is then on your side. It is legal and it is frequently a mistake — a conversation about a shared reduction taken properly from both sides usually produces a better outcome for both gardens.
If the real problem is height and light rather than encroachment, the route is a high hedge complaint to Redditch Borough Council under Part 8 of the Anti-social Behaviour Act 2003 — and only after genuinely trying to resolve it directly. There is a fee, and the council cannot order the hedge below two metres or order it removed.
Got a Leylandii hedge that's got away?
Send a photo or describe it. We'll tell you straight whether reduction is possible before quoting anything.
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