A garden that works with the wind and the salt

Coastal gardens are generous in ways that inland plots can only dream of. You have light, you have air moving freely, and you have a growing season that stretches longer than almost anywhere else in Britain. What you often lack is rain, rich soil and shelter. A gravel garden turns those apparent drawbacks into an advantage. Instead of fighting the drainage, you lean into it entirely.

The principle is simple. Build a free-draining bed with a base of sand or grit, top it with gravel, then plant those wonderful thugs of the seaside — sea holly, thrift and fescue — and let them get on with it. Do it well and you will have a garden that looks after itself while feeding bees, butterflies and birds from May to October.

Building the base: gravel over sand or grit

Gravel alone is not enough. Underneath the decorative surface you need a growing medium that drains within minutes of a downpour but still holds enough moisture for roots to find. The simplest recipe is one part garden soil to one part horticultural grit or sharp sand, mixed to a depth of at least 20cm. If your existing soil is heavy clay, dig in extra grit and consider raising the bed by 10cm to lift crowns clear of winter wet.

On top, spread 5–7cm of washed gravel. Anything from 10mm to 20mm works well; pea shingle looks smart but shifts underfoot, while larger angular gravel knits together and resists wind scatter. Keep the gravel clear of plant stems by a finger's width so the crown stays dry, and never bury the collar of a plant. This is the single biggest cause of losses in gravel gardens.

A few practical points before you plant:

• Choose a south- or west-facing site that catches the sun and warms early.
• Avoid plastic membrane across the whole bed. It restricts self-seeding, which is half the charm of gravel planting.
• If weeds are a real problem, use a permeable membrane only under paths and seating areas.
• Leave a few patches of bare gravel unplanted — solitary bees and basking insects will use them.

Choosing your coastal plants

Sea holly (Eryngium) is the anchor. Its steely blue stems and cone-like flowers hold their structure into winter and are magnets for hoverflies. Eryngium maritimum is our native sea holly and protected in the wild, so look for garden-raised plants or grow it from seed. Where space is tight, try the smaller Eryngium variifolium or the taller E. giganteum, which suits a gravel bed just as well.

Thrift (Armeria maritima) is the perfect front-of-border cushion. It forms tight evergreen domes of narrow leaves and produces pale pink pom-pom flowers from April, often repeating in late summer. It tolerates salt spray, wind and drought, and bumblebees adore it. Plant it where you can brush past it.

Fescue grasses give the garden its movement. Festuca rubra and Festuca ovina are both British natives, forming fine blue-green tussocks that catch the light and rustle in the wind. Scatter them between the flowering plants to knit the whole thing together.

Round out the planting with:

• Sea campion (Silene uniflora) for white flowers over grey-green mats.
• Kidney vetch (Anthyllis vulneraria), the sole food plant of the small blue butterfly caterpillar.
• Sea lavender (Limonium) for papery flowers that dry beautifully on the stem.
• Viper's bugloss (Echium vulgare) for a long season of nectar on brilliant blue spikes.
• Yellow horned poppy (Glaucium flavum), a short-lived but glorious self-seeder for shingle-like ground.

Spacing, planting and leaving room to move

The temptation is to fill every gap. Resist it. Coastal plants are used to growing with their roots in poor, open ground and they spread wider than you expect. Space them roughly 40–60cm apart, closer for thrift and fescue, wider for sea holly and sea lavender. Bare gravel between plants is not a failure — it is a design feature that lets each plant show its shape and lets the wind move between them.

Plant in autumn or early spring, when the soil is workable and the roots can settle before summer heat. Water each plant in once, firmly, then leave it. Add a thin gravel top-up around the crown after planting, and label anything rare so you do not hoe it out by mistake in March.

Skip the compost, hold back on the water

This is the part that feels wrong to gardeners of a certain habit. Do not enrich the bed with compost, manure or fertiliser. Rich soil makes coastal plants soft, leggy and short-lived. Floppy sea holly stems snap in the wind and thrift grows into a limp mat that flowers poorly. Poor soil keeps them compact, tough and floriferous — exactly what you want.

Water only during the first summer, and only if it is genuinely dry. After that, the plants you have chosen should fend for themselves. Overwatering does more damage in a gravel garden than drought ever will.

Looking after it through the seasons

Leave the seedheads standing through winter. Fescue tussocks, eryngium cones and dried sea lavender give structure and feed birds, while hollow stems shelter overwintering insects. Cut everything back in late February or early March, once the worst of the weather has passed, and tidy the gravel with a soft rake rather than a hoe.

Weed little and often, by hand, when the ground is damp — annual weeds pull easily from gravel. Above all, let some plants self-seed. Allow sea campion to creep along the edges, let viper's bugloss pop up where it pleases. That loose, generous quality is what makes a coastal gravel garden feel alive rather than merely planted.