Why coastal gardens need a different approach

Gardening on an exposed coastal site is a lesson in humility. The wind arrives laden with salt, which scorches leaves, strips buds and burns new growth. Even a steady onshore breeze will dry out foliage faster than roots can replace the moisture, so plants that look perfectly hardy a mile inland can sulk, blacken and die within a season. Add thin, free-draining, often alkaline soil and you have conditions that punish anything tender.

The good news is that exposure is not the enemy of beauty. Some of the most characterful gardens in Britain sit within sight of the sea, built on a simple principle: work with the wind rather than against it. Choose plants that evolved on cliffs and dunes, give them shelter while they establish, and you will have a garden that looks better, not worse, for the weather.

Build shelter first, then plant

Before you buy a single shrub, decide how you will break the wind. A solid wall or fence seems the obvious answer, but it creates damaging turbulence on the sheltered side, buffeting plants just as badly. A permeable barrier is far kinder. Aim for something around 50 per cent porous, which filters the wind and slows it down rather than deflecting it upward.

• Living windbreak hedging: species such as Griselinia littoralis, Escallonia, Olearia traversii, Pittosporum tenuifolium and Elaeagnus cope with salt and shearing. Plant in a double staggered row, roughly 60cm apart, and trim lightly in late spring to keep them dense to the base.
• Sea buckthorn and tamarisk are excellent for the harshest front line, though both appreciate room to spread.
• Woven willow or hazel hurdles make an instant, temporary screen while hedging fills in.
• Site your barrier so the sheltered zone is at least three times its height, and plant the most tender specimens in that lee.

If your plot is very small, even a low 90cm hedge around a seating area will transform what you can grow. It also raises soil temperature slightly, which helps marginally tender plants through the winter.

Tough shrubs that shrug off salt

Once shelter is in place, you can widen your palette considerably. The following have all earned their place on windswept sites, provided they are watered well through their first two summers.

• Rosa rugosa – rugosa roses are almost indestructible, with crinkled leaves, fragrant flowers and bright hips. They also sucker, which makes them useful for stabilising loose ground.
• Hebe and Olearia – glossy evergreens that give structure right through winter.
• Cistus and Lavandula – sun lovers that revel in free-draining, alkaline soil and resent nothing but wet feet.
• Euphorbia characias – architectural, evergreen and remarkably tolerant of spray.
• Hydrangea paniculata – in a sheltered pocket, its cones of flower last for months.

Plant in autumn wherever possible. The soil is still warm, rain is reliable and roots settle before the gales of January arrive. Water generously for the first two growing seasons, then ease off as plants become self-sufficient.

Ornamental grasses: movement and resilience

Grasses are the making of a coastal garden. They bend rather than break, their narrow leaves lose little moisture, and they catch the light in a way few shrubs can match. In a strong breeze, a bed of grasses looks intentional and alive rather than battered.

• Anemanthele lessoniana (pheasant's tail grass) – evergreen, arching, with orange and bronze tones in winter.
• Stipa tenuissima – fine, wispy and endlessly mobile, though short-lived in heavy soil.
• Miscanthus sinensis – taller and more substantial, good for a mid-border screen.
• Festuca glauca – compact blue-grey mounds, ideal at the front edge where salt-laden wind hits first.
• Calamagrostis – upright and sturdy, with bleached seedheads that hold their shape.

Leave stems standing over winter for wildlife and structure, then cut back hard in late February or early March, just as new growth stirs. On very windy sites, avoid over-feeding, which produces soft, floppy growth that snaps.

Soil, mulching and planting technique

Coastal soil is often thin, sandy and low in organic matter, so a little groundwork pays off handsomely. Improve the planting hole with well-rotted compost or soil conditioner, but do not over-enrich the backfill; you want roots to venture outward. Add a handful of slow-release fertiliser at planting time and a mulch of gravel or bark.

Gravel mulch is particularly useful. It suppresses weeds, conserves moisture and, crucially, keeps the soil surface dry around the collar of drought-loving plants such as lavender and cistus, which rot in damp winters. Plant slightly deeper than usual to keep roots firm, and stake only what genuinely needs it. Try planting bare-root hedging in a shallow trench, backfilled and firmed in stages, so no air pockets remain.

Aim to plant in dense layers: a low front edge of Armeria maritima, Thymus or Sedum, mid-height grasses and perennials, and shrubs behind. Bare soil simply invites wind erosion and weeds.

Maintenance through the seasons

Little and often is the rule. Trim hedges once a year, after the worst of the spring gales, and resist the urge to cut hard into old wood on evergreens. Remove damaged or blackened foliage as you see it, so the plant directs energy into fresh growth.

In late winter, top-dress borders with compost and check stakes and ties before the equinox winds. Summer watering should be thorough but infrequent, encouraging deep roots. If salt burn appears after a storm, a gentle rinse with fresh water on a calm evening will help, though most of the plants suggested here will simply grow through it.

Give a coastal garden three years and it will find its own rhythm. What felt like a punishing site becomes a place of texture, movement and surprising abundance.