Why gravel makes sense by the coast

If you garden within a mile or two of the shore, you already know the conditions: wind that strips moisture from leaves, salt spray that scorches tender growth, and soil that is often thin, sandy and quick to drain. A gravel garden turns those difficulties into an advantage. Gravel acts as a mulch, suppressing weeds, keeping roots cool in summer and stopping the soil surface from baking into a crust. It also sheds rain fast, which matters enormously for plants that dislike winter wet far more than they mind cold.

There is a practical bonus, too. Gravel reflects light on grey coastal days and holds warmth, releasing it slowly overnight, which can nudge your growing season along and help coastal natives ripen their growth before winter bites.

Preparing the ground properly

Gravel gardens succeed or fail on preparation. Skimp here and you will spend years pulling couch grass out of shingle.

• Clear weeds thoroughly. Fork out perennial weeds — couch grass, ground elder, bindweed, dock — over several weeks rather than one frantic afternoon. If the site is badly infested, a systemic weedkiller applied to fresh growth is a legitimate tool; always follow the label exactly.
• Test the drainage. Dig a hole 30cm deep, fill it with water and see how long it takes to disappear. If it is still full after an hour, break up the subsoil and work in coarse grit across the whole area.
• Improve the soil. On sand, add two buckets of well-rotted organic matter per square metre to hold moisture and nutrients. On clay, add grit and compost together to open it up.
• Firm and level. Rake the surface flat, then tread or roll it lightly. A settled base stops gravel vanishing into hollows.
• Lay 5–8cm of gravel. Angular 10–14mm gravel is ideal, or 20mm for a chunkier finish. Avoid pea shingle, which rolls underfoot, and very pale stone, which glares in bright light.

Skip landscape fabric. It looks tidy for a season, then creeps to the surface and prevents the self-seeding that gives these plantings their charm.

Native British plants that earn their place

Choose species that evolved on cliffs, dunes and shingle, and they will settle in as though they had always been there. Plant in generous groups of three or five rather than dotting singles about.

• Sea thrift (Armeria maritima) — pink drumstick flowers on tight evergreen cushions, utterly salt-tolerant.
• Sea campion (Silene uniflora) — white flowers and grey-green leaves, superb spilling over gravel.
• Kidney vetch (Anthyllis vulneraria) — yellow, sometimes orange, flowers over a long season.
• Wild thyme (Thymus polytrichus) — low, aromatic and a magnet for bees.
• Viper's bugloss (Echium vulgare) — brilliant blue flowers, short-lived but freely self-seeding.
• Yarrow (Achillea millefolium) — flat white heads, drought-proof and long-flowering.
• Sea lavender (Limonium vulgare) — papery purple flowers in late summer.
• Bloody cranesbill (Geranium sanguineum) — magenta flowers and excellent autumn colour.
• Red fescue (Festuca rubra) — a fine native grass that knits the planting together.
• Sea kale (Crambe maritima) — bold grey-blue leaves and honey-scented white flowers. Buy it from a nursery; never lift it from the wild.

Underplant with native bulbs such as spring squill and wild garlic for early interest, and allow a few non-native companions — rosemary, lavender, cistus — into the mix if you want summer scent.

Planting up and the first season

Autumn and early spring are the best planting windows, while the soil is warm and damp. Water each plant in well, then draw the gravel back around it, keeping it clear of the stems and crown — buried collars rot in wet winters. Space perennials roughly 30–45cm apart so they can knit together within two or three seasons. For anything prone to crown rot, such as thyme, sit it on a handful of grit.

Water through the first summer whenever there is a dry spell, giving a thorough soak rather than a daily sprinkle, until roots are established. After that, only water in a genuine drought. Resist feeding: rich soil produces soft, floppy growth that coastal wind shreds.

Keeping maintenance genuinely light

The annual rhythm is short. In late winter or early spring, cut back the previous year's growth, leaving some seedheads standing through the winter for the birds. Hoe or hand-pull weed seedlings in spring while the gravel is still damp — they lift out with almost no effort. Top up the gravel every few years, and after gales simply snip out any wind-battered stems rather than tidying the whole plant.

Expect a few losses, especially of short-lived species, and treat gaps as opportunities: scatter seed from your own plants in autumn and let the garden edit itself. That willingness to let things move about is what keeps a coastal gravel garden looking relaxed, generous and wonderfully undemanding.