← All guides · Coastal · Updated September 2026

Designing a windbreak hedge for the Dover clifftop.

On the clifftops above St Margaret's Bay and at Kingsdown, the question before planting any ornamental hedge is often whether you can establish one at all without first putting up something to break the Channel wind. A windbreak hedge is a different proposition from a boundary hedge: the design logic, the species choice and the establishment approach all change once the goal is shelter rather than enclosure.

Why a windbreak hedge is not the same as a boundary hedge

Most hedges serve two functions at once: they mark a boundary and they provide shelter. On an exposed clifftop site above St Margaret's Bay or South Foreland, these two functions come apart. The boundary may run any direction, but the wind comes from the south-west. The hedges that mark the eastern and northern boundaries of the garden are doing little useful work against the prevailing wind; it is the south-western and western face of the garden that needs a specific planting strategy if the rest of the space is ever going to be usable.

A windbreak designed specifically to reduce wind speed works on a different principle from an ornamental hedge. Its value is in its permeability: a solid barrier, whether that is a close-boarded fence, a dense wall, or a very tightly-clipped formal hedge, deflects wind up and over and then deposits it as a violent downdraft on the leeward side, often at greater speed than the undisturbed wind. A permeable hedge that lets roughly 40 to 50 per cent of the wind through, filtering rather than blocking it, slows the airflow across the whole leeward zone instead. A commonly quoted rule of thumb puts the effective leeward protection zone at up to ten times the height of the windbreak, so a 2 metre hedge shelters an area up to about 20 metres deep on the calm side.

On the chalk soils around St Margaret's, Kingsdown and Ringwould, this matters doubly because wind desiccation compounds the chalk's natural tendency to dry out. A 1.5 to 2 metre windbreak hedge established on the south-western boundary before anything else is planted behind it is not an extra; it is the enabling step that makes the rest of the garden viable. For detail on which species withstand the salt wind in the open clifftop phase before any windbreak is in place, our salt-wind resilient species guide covers the full picture.

Orientation: where to plant relative to the Channel wind

The prevailing wind direction along this stretch of the Kent coast is predominantly from the south-west, following the Channel. In autumn and winter, when Channel gales drive in from the Atlantic, the SW to W sector is where the worst sustained wind comes from. Secondary exposure comes from the north-east in winter, and from the south-east when the wind swings as a low-pressure system crosses the Channel.

On a typical clifftop or Kingsdown garden, the priority windbreak faces SW to W. If the plot is wide enough, a secondary row on the northern or north-eastern boundary handles the winter NE exposure and the sea breeze that can channel up the Bay in summer. The idea is not to enclose the garden entirely but to intercept the dominant wind vectors.

Practical positioning: plant the windbreak at least 1 to 1.5 metres inside the boundary, not on it. This gives the hedge room to develop without overhanging a neighbour's land (which can create a dispute under the Anti-social Behaviour Act 2003, Part 8, once the hedge passes 2 metres at the neighbour's side), and it gives you access to both faces of the hedge for maintenance. On exposed clifftop sites above St Margaret's Bay, the plants on the windward face will take years to thicken on that side; reaching them from behind while they establish is important. Our high hedges neighbour law guide has the full detail on the 2-metre legal threshold and how Dover District Council handles complaints.

Temporary protection during establishment

On a fully exposed clifftop site, bare-root windbreak plants need their own protection during the two to three years it takes them to reach a functional height. The standard approach is polypropylene windbreak netting: woven mesh staked on the windward side of the new planting at roughly the same height as the planted whips. It is permeable (the same 40 to 50 per cent porosity principle applies), cheap, and removable once the hedge has thickened.

An important point on St Margaret's chalk soils: the stakes for the netting need to go deep enough to resist gale-force winter winds. In shallow chalk, stakes driven less than 45 to 50 centimetres do not hold under sustained gale load; use proper fencing stakes rather than bamboo canes, and anchor the base of the netting to prevent it acting as a sail and pulling the stakes loose. On the most exposed Bay-facing gardens, we re-tension the netting after the first significant autumn gale as a matter of routine.

Woven hurdles of willow or hazel are a traditional alternative that also filter rather than block the wind, and they look more considered than plastic netting. They last three to five years before needing replacement, by which time the hedge behind them should be providing its own protection. The cost is higher, but if the garden is already in an AONB or conservation-area setting, a natural material fits better. The St Margaret's Bay Conservation Area covers parts of the Bay itself; our conservation-area rules guide has the detail on what the designation means for garden work.

Species for each exposure level

The windbreak species on this stretch of the Dover coast are not the same species you would choose for a formal ornamental hedge in a sheltered garden. The priority is root vigour, wind-firmness and genuine salt tolerance.

Clifftop and Bay (most exposed): hawthorn (Crataegus monogyna) is the single most reliable windbreak species for exposed UK sites, including chalk clifftops. It roots deep, tolerates any aspect and any level of wind, and once established, it is genuinely durable rather than merely surviving. Blackthorn (Prunus spinosa) is equally tough, suckers to thicken the base naturally, and provides exceptional wildlife value: nesting cover, sloe flowers in March, fruit in October. Sea buckthorn (Hippophae rhamnoides) naturally colonises exposed coastal shingle and cliff edges across the Kent coast, and it makes an excellent outer row on the most exposed sites; it fixes nitrogen, which helps on the thin chalk soils, and its root system is particularly wind-firm. For detail on planting sea buckthorn, male-to-female ratios for berries, and managing suckering on chalk, our sea buckthorn hedging guide covers the full picture. For how hawthorn and blackthorn compare for wildlife value in the context of a mixed native hedge, our native wildlife hedging guide has the full species rankings.

Village and inland (moderate): once you are back from the cliff edge in St Margaret's at Cliffe village itself, hawthorn still makes the best first row on the SW face, but the species palette behind and beside it widens. Hornbeam (Carpinus betulus) is well-suited to the chalk and provides good winter colour because it holds its dead leaves through to spring. Field maple (Acer campestre) is genuinely chalk-adapted and makes a dense, wind-tolerant hedge at moderate exposure. A mixed-native row of hawthorn, field maple and hazel is the most ecologically productive choice at this exposure level.

Dover town and sheltered sites: in sheltered CT16 and CT17 gardens, the range of viable hedging species is much wider and the specific windbreak requirement drops away. Yew, beech and hornbeam all have a long history on the chalk of the Dover downs and perform reliably here. The soil preparation and establishment details for chalk-adapted species, including yew and beech, are in our chalk-soil establishment guide.

Establishment timescales by exposure

At clifftop exposure, with temporary netting in place and chalk soils prepared correctly, hawthorn and blackthorn whips typically reach 1 to 1.5 metres within two to three years of planting, which is when they begin to provide meaningful shelter. The hedge will not be dense enough to trim into a formal shape for four to five years: until then, the aim is height and lateral fill, not a neat face. Cutting the tops lightly each spring at this stage encourages side-branching and thickens the base, which is where the shelter is created.

At village exposure, without the extreme clifftop desiccation, bare-root hawthorn and hornbeam typically reach a useful height of 1.2 to 1.5 metres in two years. On chalk soils with good preparation, they can be in a position to start formal trimming from year three.

At sheltered Dover town exposures, establishment is generally faster and the main limiting factor is the chalk drainage rather than the wind. Year-two trimming is possible for most species on well-prepared chalk if the planting was done between November and January. See our chalk-soil establishment guide for the soil preparation that makes that timeline achievable.

What to plant in the leeward zone

Once a windbreak hedge is established at a useful height (1.5 metres or taller is the practical threshold), the zone behind it on the leeward side becomes a categorically different environment. Wind speed in this protected zone is noticeably lower than on the open clifftop. This means species that would not survive in the open become viable: roses, escallonia, olearia, photinia and even beech can be established in the first 10 to 15 metres behind a good windbreak hedge at Kingsdown or St Margaret's Bay. You are also increasing the effective growing season for anything planted here, because the reduced wind cuts the physical and desiccation damage that interrupts growth on exposed coastal gardens.

The layered approach (a hawthorn and blackthorn outer windbreak, a mixed-native or hornbeam second row, and then ornamental or formal planting behind) is what most established clifftop gardens around South Foreland have arrived at through trial and error over decades. Starting with the windbreak layer first, rather than trying to establish everything at once, avoids losing three or four years of growth to wind damage on plants that were never going to survive in the open.

Clearance before planting and the nesting-season constraint

If the site currently has old scrub, bramble or remnant hedging that needs clearing before the windbreak planting goes in, the Wildlife and Countryside Act 1981, section 1, is directly relevant. Under section 1 it is a criminal offence to damage or destroy an active wild bird's nest. The main nesting season runs 1 March to 31 August. Any clearance of scrub or existing hedgerow on the planting site needs to be completed before 1 March, which dovetails with the ideal bare-root planting window of November to February. If you are tackling this in late autumn, carry out any clearance first, then plant into the prepared ground immediately while still within the bare-root season. For a full walkthrough of the bare-root planting process specifically graded for Channel gale conditions, including staking, temporary windbreak netting during establishment and chalk-soil aftercare, see our autumn bare-root hedge planting guide.

Sources: Ashridge Nurseries, "How to Plant a Bareroot Native Country Hedge" (YouTube, January 2025); Wildlife and Countryside Act 1981, section 1 (nesting season); Anti-social Behaviour Act 2003, Part 8 (high hedges).