How to cut a hedge: technique and profile for the Tenterden Weald.

Cutting technique · Updated 25 September 2026

Getting the profile right is the one decision that determines whether the hedge stays dense down to the base over the next ten years or gradually loses its bottom third. On the heavy Wealden clay around Tenterden, St Michaels and the Weald villages, hawthorn and blackthorn grow vigorously in the upper half and tend to push all that energy outward if the profile isn't actively managed from the start. The method below is what I use on every maintenance job, from a short garden boundary run on the High Street to a 60m mixed-species field boundary out toward Rolvenden.

The A-frame profile: the single most important decision

A hedge cut with vertical sides looks smart for the first season. By year three, the base is bare. The reason is simple: with vertical sides, the upper growth shades the lower, and the lower stops producing foliage. Once hawthorn or blackthorn drops its base growth it rarely recovers it, so what you're left with is a thick top on bare stems, and the only fix at that point is hard renovation work over two or three seasons.

The correct profile is wider at the base than at the top. The RHS calls this a "battering" or A-frame profile. On a 1.5m hawthorn hedge I aim for a base that's about 300mm wider than the top, roughly 100-150mm each side. That angle keeps light reaching the lowest shoots year-round, which is what keeps the base dense. On holly, which is slower to recover and holds foliage even lower, I keep the taper a little less aggressive, but the principle is the same.

For formal hedges on the High Street where a crisp vertical face is expected, beech and yew will tolerate much tighter profiles than hawthorn because their growth habit is different. Even then, a very slight inward lean from base to top (20-30mm a side) is worth maintaining: it's barely visible to the eye but prevents the long-term shading problem.

The step-by-step method

1. Check timing and inspect for active nests

Before any cutting, confirm the date and hedge type against the nesting-season caution window. For native mixed hedgerows on the Weald, the safe default is September to February. If the job is inside that window, a visual inspection takes five minutes and can save you from an offence under section 1 of the Wildlife and Countryside Act 1981.

2. Deal with thick stems before the trimmer pass

Any stem over about 20mm diameter that the trimmer would struggle with or leave jagged should come out first with loppers. On an annual cut this is rarely more than a few wayward leaders. On a hedge that's had two years without attention it can be a significant amount of pre-work. Cutting these by hand first means the trimmer pass is clean, and you're not forcing the blades through wood they're not rated for, which blunts them and leaves ragged cuts that brown off more visibly.

For stems over 50mm, particularly in old holly or a Leylandii that's been part-neglected, use a pruning saw rather than loppers. Cut just above a healthy outward-facing side shoot where possible so the plant regrows into the gap cleanly.

3. Cut the sides first, bottom to top, blade angled for the A-frame

Work one face at a time. Start at the base and sweep the trimmer upward, keeping the blade at a slight angle inward so you're already cutting toward the A-frame profile rather than away from it. The RHS guidance on this is to keep the blade parallel to the intended hedge face, which on a battered hedge means the blade face is angled, not vertical.

On a long run, string a guide line between canes at the right taper angle before you start. Two minutes setting this up saves twenty minutes trying to eyeball a consistent profile on a 30m run. I do this on every job that's longer than about 8m and where the customer wants a crisp finish.

Work from the ground side you have easiest access to first, then the other side. For a roadside hedge in St Michaels or Smallhythe, that means completing the garden-facing side before moving to the road side where traffic management matters.

4. Cut the top last, working along the run

Once both faces are done, cut the top with the blade held horizontally, keeping an even depth off the previous season's top. For a formal flat top on beech or yew, a string line set at the target height is essential: you simply won't hold a consistent level freehand over 10m or more. For a more natural rounded top on native hawthorn or blackthorn, freehand works if you step back and sight along the run every couple of metres.

Take off enough to stimulate new growth, but not so much that you're cutting into old wood that won't regenerate. On hawthorn, that means staying in the current season's green growth plus, at most, 100-150mm into last year's wood. Deeper cuts into old wood on hawthorn can be done in renovation work, but that's a separate operation with different rules.

5. Clear arisings thoroughly, especially on clay

This is where clay-specific practice differs from lighter soils. Wealden clay holds water and stays cold into late spring. A thick layer of wet hawthorn clippings piled against the base of a hedge can sit damp for weeks, which encourages fungal growth and can prevent new shoots at the base from pushing through. Rake arisings clear of the root zone and compost or take them off-site.

On a long field-boundary run, spreading them thinly on an adjacent path or bare ground where they'll dry is fine. What to avoid is leaving a dense mat of wet clippings in direct contact with the base stems, particularly if the soil is already waterlogged after autumn rain.

Formal hedges on the Tenterden High Street

The conservation area on the High Street (Ashford ref CA-43, designated 10 October 1996) contains some formal beech, yew and box hedges associated with the Georgian and Victorian properties. These have different requirements from a native field-boundary hawthorn run. Beech and yew tolerate tighter profiles and harder top cuts, and the expectation on a High Street property is often a crisp geometric finish rather than a naturalistic one.

The timing advice is the same as anywhere: beech and yew are best cut in late August or September once nesting risk is lower. Box is better done in late May or early June for the main cut, with a light tidy in autumn if needed. Any stem over 75mm inside the conservation area boundary triggers the section 211 notice requirement regardless of species, so I check stem diameters before quoting on any CA-adjacent job.

When to call a contractor

The method above is straightforward on a well-maintained garden hedge at ground level. Three situations call for a professional rather than a DIY attempt: any hedge over about 2m where working from a ladder alone is genuinely risky; any run inside the Tenterden conservation area where stem diameters need measuring and possibly notifying before work begins; and any job between March and August where a nest check is needed and the legal exposure of getting it wrong is yours.

Sources: RHS "What is the best way to cut a hedge?" (RHS YouTube channel, 4 September 2025, featuring RHS Horticulturist Alesandra Sana); RHS "How to Trim a Hedge" advisory, rhs.org.uk; Wildlife and Countryside Act 1981 s.1; Town and Country Planning Act 1990 s.211; British Geological Survey Wealden Group clay stratigraphy.