Further than most people expect on the forgiving species, and not far at all on the ones that aren't. The species decides it — everything else is detail.
Species by species
| Hedge | How hard | Notes |
|---|---|---|
| Privet | Very hard | Extremely forgiving; recovers quickly |
| Yew | Very hard | The conifer that regrows from old wood |
| Laurel | Hard | Responds strongly, sometimes vigorously |
| Hawthorn, blackthorn | Hard | Tough; suits laying as well |
| Beech, hornbeam | Hard | Better staged if severe |
| Holly | Hard | Slow to recover, and slow to cut |
| Box | Moderate | Recovers, but slowly |
| Leylandii, cypress | Green only | No regrowth from bare wood |
The conifer rule, and how to check it
Push a hand into the hedge and look at where the green stops. On a conifer that's been maintained, green growth may extend a foot or more inward. On one left for years, it can be a couple of inches at the very surface. That distance is the entire scope of what can be cut back — measurable in advance rather than discovered afterwards.
One face at a time
On a badly overgrown hedge that's both too tall and too wide, doing everything in one operation asks a great deal of the plant. The better approach is staged.
- Cut the first face hard, back to your target line, and leave the other intact so the hedge can keep feeding itself.
- Give it a full growing season to respond.
- Then do the second face the following year.
- Re-establish a taper while you're at it — narrower at the top than the bottom.
- Then trim to that line, not outside it, from then on.
It costs more across two visits and produces a hedge rather than a casualty.
What helps it recover
- Cut at the right time of year for the species.
- Water in a dry spell afterwards, especially in the first year.
- Clear the base of years of accumulated leaf litter, then mulch it.
- Feed the following spring.
- Don't cut again until it's responded.
- Clear whatever is growing through it — brambles and ivy compete hard with a stressed hedge.
What to expect
- Bare and brown on the cut faces, immediately.
- Worse-looking than before, for a season.
- First regrowth within weeks to months, depending on species and timing.
- A recognisable hedge again within one to two growing seasons on forgiving species.
- The base may stay sparse if it's been shaded out for years.
- And it'll need cutting regularly from now on, or you're back where you started.
When not to cut back hard
- A conifer already at its green limit.
- A hedge in poor health — deal with the cause first.
- In hot dry weather, or in hard frost.
- During nesting season with an active nest present.
- Where the hedge is genuinely past recovery and replacement is the honest answer.
Wondering how far yours can go?
Send a photo. Identifying the species is usually the whole answer.