Designing a windbreak for a seaside garden

Why the seaside wind deserves its own plan

A garden within earshot of the sea is a wonderful thing, but the wind that comes with it is a different creature from the breeze that ruffles a sheltered inland plot. Coastal air arrives with salt in it, often at a steady force rather than in gusts, and it carries a sting: salt burns leaf edges, dries out buds, and batters anything tender into submission. Add the funnel effect of a gap between buildings and you have a garden where roses sulk and young trees lean permanently eastwards.

The good news is that you do not need a wall of concrete to tame it. A well-designed windbreak takes the edge off the weather without turning your plot into a still, airless pocket — and the difference it makes to what you can grow is remarkable.

Filter the wind, don't fight it

This is the single most useful principle. A solid barrier is the beginner's mistake. When wind hits an unbroken wall it is forced up and over, then tumbles down the other side in violent eddies that can be harsher than the original breeze. A solid fence also creates a dead, stagnant zone immediately behind it: poor for plants, and in a damp coastal climate a recipe for mould and mildew.

A porous barrier, by contrast, bleeds some air through. Aim for roughly 50 per cent permeability — the kind of open weave you can see daylight through. This slows the wind rather than stopping it, and the sheltered zone behind extends much further: generally five to ten times the height of the barrier, compared with two or three times the height for a solid version.

Choosing your barrier: hurdles, hedges and slatted screens

There is no single right answer. It depends on how exposed you are, how much space you have, and whether you want something that looks good from both sides.

• Woven hazel or willow hurdles — Beautiful in a cottage or gravel-garden setting and instantly effective. Buy the tightest weave you can afford, and expect to replace or re-panel them every six to eight years. Soak them well before installation so they swell and tighten.
• Slatted timber or chestnut paling fences — More durable than hurdles and easy to repair in sections. Horizontal slats with gaps of 25-50mm give you good porosity. Avoid feather-edge boards or anything tongue-and-groove, which behaves as a solid wall.
• Reed or brushwood screens — Cheap, light and superb as a temporary fix around a new planting scheme. Not a long-term solution, but they will shield seedlings through their first two winters.
• Living hedges — The gold standard if you have room. They filter wind, absorb salt spray, provide habitat and improve with age. They need a metre or more of width and a few years to knit together, so plant them behind a temporary screen.

Positioning: the detail that decides whether it works

Where you put the windbreak matters as much as what you build it from. Work out the prevailing wind direction first — on most of the British coast that means south-westerly, though a north-easterly can bite hard in spring. Then:

• Place the barrier upwind of the plants you want to protect, rather than ringing them completely. Enclosing a bed traps cold air and creates a frost pocket.
• Allow a gap of at least 1-2 metres between the barrier and the first delicate plants. Right up against the fence is the most turbulent spot of all.
• Do not seal the ends. Leaving small gaps at the corners reduces the funnelling effect that makes a narrow opening between two screens so damaging.
• On a sloping site, run the windbreak along the contour rather than up and down the slope, otherwise you simply channel the wind downhill.
• If your plot is very open, use two or three staggered rows of lower barriers rather than one tall one. Staggered planting is the classic field-shelter technique and it works beautifully in gardens.

Planting a living windbreak for coastal conditions

If you can wait a few seasons, a hedge is the best investment you will make. Choose species that shrug off salt and wind rather than fighting the site.

• Hawthorn — Tough, dense, native and untroubled by salt. Ideal for a mixed hedge.
• Sea buckthorn — Superb on the most exposed, sandy sites, with silvery foliage and orange berries. It suckers freely, so give it room.
• Escallonia — Glossy evergreen with pink or white flowers; excellent in milder coastal areas.
• Griselinia littoralis — The classic seaside evergreen for the south and west, with apple-green leaves.
• Holm oak and tamarisk — Both are salt-tolerant and make good taller shelter in larger gardens.
• Grasses and perennials — For an informal screen, plant the front of the border with phormium, carex or sea holly, which slow ground-level wind and look handsome doing it.

Keeping it working through the seasons

Windbreaks are not a one-off job. Check timber screens after winter storms for loose ties or cracked slats, and re-tension wire where it has slackened. Trim hedges in late summer and never during the nesting season, and keep the base dense — a hedge that goes bare at the bottom lets wind through exactly where your plants are sitting.

In winter, when the wind is at its most searching and the ground at its wettest, this shelter is the difference between a plant surviving and a plant giving up. Walk the garden after a gale and note where the damage is worst; that will tell you precisely where the next hurdle or screen should go. Build in stages, watch how the air moves, and adjust. Your seaside garden will repay the attention with a lushness that visitors from inland will quietly envy.