Two different jobs, priced differently, and asked for interchangeably. The distinction is simple to state and worth settling before you collect quotes, because a quote for the wrong one is a quote that changes on the day.
In one line
What each one actually involves
| Trimming | Reduction | |
|---|---|---|
| What comes off | The current season's growth | Several years of growth |
| Cut into | Soft new growth | Older woody stems |
| Hedge afterwards | Same size, tidy | Noticeably smaller |
| Appearance | Green immediately | Can look bare for a season |
| Material produced | Modest | Substantial |
| Frequency | Annually | Once, then trim annually |
| Species matters? | Not much | Decisively |
That last row is the one that catches people. Trimming works on any hedge. Reduction only works on hedges that regrow from old wood — which excludes most conifers.
How to tell which yours needs
Look into the hedge from the side and try to find the old cutting line — a change in stem thickness, or a shelf of older growth sitting inside the newer growth.
If you can see it, the hedge has been held to a line and a trim back to that line will work. If there is no shelf at all — just increasingly thick stems the further in you look — then either the line has been lost or the hedge was never held to one. Either way, there is nothing to trim back to, and that makes it a reduction.
The other signs it is past trimming
- It has spread into a border, over a path or across a drive.
- It is beyond reach from a step ladder.
- It is wider at the top than the bottom.
- The base has gone bare and leggy while the top stayed dense.
- It has not been properly cut in four or five years.
- You are cutting it more often but it keeps getting bigger anyway.
That last one is the giveaway that most people miss. It is the sign that the hedge is being trimmed to wherever it has reached rather than back to a fixed line, so every cut starts from further out than the last.
Why the cheaper job sometimes solves nothing
A hedge that is only ever trimmed has no fixed reference point, so it drifts outward no matter how often it is cut. A reduction is worth paying for not because of the material it removes but because it re-establishes a line for every future cut to be measured against — which is what actually stops the creep.
Over ten years, one reduction followed by nine annual trims works out cheaper than a decade of trimming alone, and the hedge is the size you want it throughout rather than a little larger each year.
The conifer complication
On Leylandii, Lawson, thuja and most other conifers, there is a second question after "does it need reducing": can it be reduced at all?
These do not regrow from bare brown wood, so the reduction is capped at the depth of live green. Push a hand into the foliage — top and each face separately, because they differ — and see how far the green goes. That measurement decides whether reduction is available.
It is also why leaving a conifer hedge is worse than leaving a beech one. Every uncut year the green shell moves outward and the bare interior grows behind it, so the distance you can ever cut back to shrinks. That option can disappear permanently.
What to ask for
Whichever it turns out to be, ask what line the hedge is being cut to, and ask for the same line next time. It costs nothing, it is the entire difference between a hedge that stays put and one that drifts, and almost nobody asks it.
Not sure which you're asking for?
Send a photo or describe the hedge. We'll tell you which job it is before quoting.
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