What the Coast Asks of a Plant

Gardening within a few miles of the sea is a lesson in reading the wind. Salt is carried inland in fine droplets, and where it lands on foliage it draws moisture out of the leaves and scorches the margins, leaving them brown and brittle. Add the drying effect of near-constant wind, which strips moisture from leaves faster than the roots can replace it, and free-draining sandy or shingly soil, and you have a set of conditions that would flatten most traditional herbaceous borders by August.

The good news is that the coast also offers mild winters, bright light and excellent air movement, which keeps fungal problems at bay. Choose plants with leathery, waxy, silvered or narrow leaves — adaptations that reduce water loss and shrug off salt — and a seaside garden becomes generous rather than grim. Shelter and soil improvement do the rest.

Evergreens That Build the Backbone

Start with the structure. A framework of tough evergreens gives you year-round bulk, filters the wind and protects softer planting on the leeward side. Aim for a layered arrangement: dense, salt-proof shrubs at the outer edge, slightly more tender favourites tucked behind them.

• Griselinia littoralis — glossy, apple-green leaves on a fast-growing shrub that clips beautifully into a hedge. It tolerates salt and wind better than almost any other evergreen, though it dislikes heavy, wet clay.
• Escallonia — reliable and quick, with clusters of pink or white flowers in midsummer. Trim lightly after flowering to keep it dense.
• Olearia traversii — an upright daisy bush with grey-green foliage that makes an outstanding windbreak hedge, reaching two metres or more.
• Elaeagnus × ebbingei — discreetly fragrant flowers in autumn and foliage that copes with shade as well as salt.
• Euonymus japonicus — neat, upright and unfussy, ideal for a low formal hedge or as a foil for grasses.
• Rosemary, lavender and Cistus — sun-loving, drought-tolerant and happy in poor, gritty ground, provided drainage is sharp.

Where you need a taller screen, consider Tamarix, which is deciduous but feathery and remarkably wind-tolerant, or the native hawthorn, which makes a stock-proof, salt-resistant boundary in exposed spots.

Ornamental Grasses for Movement and Shelter

Nothing softens a windswept garden like grasses. They bend rather than break, their rustle masks traffic and gulls, and their fibrous root systems knit sandy soil together. They also look superb backlit by low coastal sun.

• Calamagrostis × acutiflora 'Karl Foerster' — upright, buff-coloured seedheads that stand through winter without flopping.
• Anemanthele lessoniana — pheasant's tail grass, which colours to orange and copper in autumn and self-seeds politely in gravel.
• Stipa tenuissima — fine, blonde and endlessly mobile, perfect at the front of a border or beside steps.
• Miscanthus sinensis — taller selections give privacy and a late-season presence; cut them back in early spring.
• Leymus arenarius — blue lyme grass, superb for stabilising loose sand, though give it room as it runs.
• Ammophila arenaria — marram grass, the dune-builder, useful on the roughest, sandiest edge of a plot.

Leave the stems standing over winter for wildlife and structure, then cut back hard in late February before new growth emerges.

Hardy Perennials for Colour Through the Season

Once the windbreaks are in, the planting palette opens up considerably. These perennials are tough, drought-tolerant and generous with flower.

• Eryngium — sea holly, with steely blue thistles that dry beautifully and never need staking.
• Armeria maritima — thrift, a compact native that forms tight pink cushions in paving cracks and gravel.
• Nepeta — catmint, flowering for months in a haze of blue-grey, and a magnet for bees.
• Hylotelephium (sedum) spectabile — fleshy leaves and flat pink heads that fade to bronze seedheads in winter.
• Crocosmia — flame-coloured and utterly unbothered by wind, though it spreads, so lift clumps every few years.
• Salvia yangii (Russian sage) and Verbena bonariensis — airy, see-through plants that bring height without casting shade.

Planting and Windbreaks: Getting Them Established

Autumn is the ideal moment to plant on the coast: the soil is still warm, winter rain does the watering for you, and roots settle before the spring gales. Dig in plenty of well-rotted organic matter to hold moisture, and on light sand add a few handfuls of loam-based compost to each planting hole.

Shelter makes an enormous difference. A permeable windbreak — woven fabric, a slatted fence or a double row of hedging — slows the wind and lets some through, which is far kinder than a solid barrier that creates damaging turbulence on its leeward side. Even a temporary screen of netting around new plants for their first two summers will pay for itself many times over.

Mulch generously with gravel or bark. Gravel is especially useful near the shore because it stops salt splash bouncing up onto low foliage, and it keeps the crown of drought-lovers such as lavender and rosemary dry through winter.

Looking After a Coastal Garden

Water new plantings well through their first two summers, even the drought-tolerant ones — they need help until roots reach deeper, cooler soil. After that, most of the plants above will fend for themselves. Feed sparingly; rich, soft growth is exactly what wind damages most. A light general fertiliser in spring is plenty.

Prune evergreens immediately after flowering so the new growth hardens off before winter. Replace any plant that persistently scorches rather than coaxing it along, and let the survivors seed about. Coastal gardens reward a relaxed hand and a good eye for what the wind is telling you. Work with the conditions rather than against them, and you will end up with a garden that looks at home by the sea — silvered, resilient and quietly beautiful.