Reading the Site Before You Plant

Coastal gardens lose soil in three ways at once. Wind lifts dry surface particles and carries them off, heavy rain arrives in sudden bursts that sheet across the surface, and salt-laden spray scorches foliage, leaving plants weakened and root systems less able to hold ground together. Add a slope of even one in ten and you can watch a winter's worth of topsoil travel downhill in a single afternoon.

Before you buy a single plant, walk the garden after a storm. Note where water pools, where gravel has migrated, where roots sit exposed. Look at the fence line for tell-tale drifts of dry soil, and check whether run-off is leaving your plot or arriving from a neighbour's. That rough map tells you exactly where to concentrate your efforts, and it will save you a great deal of guessing later.

Deep Roots: The Quiet Engineers

Nothing holds soil like a dense, deep root system. Even in a small plot, you can build a living scaffold that knits the ground together and slows the wind at ground level. Choose a mixture of evergreens for year-round cover and herbaceous plants for fast summer growth.

• Thrift (Armeria maritima) and sea campion form tight, low cushions that shrug off salt and bind sandy soil.
• Sea holly (Eryngium) and sea kale (Crambe maritima) send roots deep and look magnificent against gravel.
• Rosemary, lavender and santolina are woody and wiry, coping with drought and wind while stabilising light soils.
• Tamarisk, escallonia and olearia make tough, salt-tolerant shrubs that break the wind at head height.
• Gorse, hawthorn and blackthorn are excellent for boundaries, though they need annual trimming to stay dense at the base.

Do buy nursery-grown stock rather than lifting plants from the dunes behind your house. Wild coastal habitats are fragile, and the plants rarely establish as well as pot-grown ones. Plant in autumn so roots can settle before the gales arrive, and water generously through the first two summers.

Mulch: A Blanket Against Wind and Rain

Bare soil is vulnerable soil. A generous mulch cushions the impact of raindrops, stops surface panning, and keeps wind from lifting dry particles. In a coastal garden it also suppresses weeds that would otherwise compete for precious moisture.

For drought-tolerant plantings, a 5cm layer of horticultural gravel looks right and lets foliage sit dry, reducing rot in wet winters. For borders and vegetable beds, use well-rotted compost, leaf mould or manure, applied 5–7cm deep in spring while the soil is still damp. Seaweed is a fine local resource, but rinse it well first to wash away excess salt. Leave a small collar of clear soil around stems and crowns so nothing smothers, and top up annually, as coastal winds strip organic matter faster than inland gardens do.

Permeable Paths and Surfaces

Every square metre of concrete or paving sends rain straight into your beds at speed. Permeable surfaces let water sink where it falls, which protects both your soil and your neighbours' plots.

• Gravel over a compacted sub-base is cheap, forgiving and easy to top up as it migrates.
• Stepping stones set into gravel or bark give clean access without sealing the ground.
• Clay pavers or resin-bound gravel suit areas that need a firmer, wheelchair-friendly finish.
• Timber or stone edging keeps loose material in place and stops it washing into borders.

Keep paths at least 60cm wide, curve them gently across the slope rather than running them straight downhill, and give them a slight camber away from beds. Where a path meets a border, a shallow gravel-filled trench will catch run-off before it scours the soil.

Slowing Run-off with Shape and Structure

On any slope, the aim is to slow water down, spread it out and let it soak away. Small interventions add up quickly. Plant on the contour rather than in straight rows up and down the hill, and let clumps of grasses and perennials form natural barriers. Low retaining walls, timber terraces or simple berms of soil and stone each interrupt the flow.

Redirect downpipes into water butts, and consider a shallow planted depression — a rain garden — at the lowest point to catch the overflow. A soakaway filled with rubble beneath a gravel-topped hollow works well in sandy ground. Whatever you do, avoid channelling water towards a boundary where it will simply become someone else's problem.

Shelter Without a Solid Wall

A solid fence looks tempting, but it creates damaging turbulence on the downwind side and can be flattened by a winter gale. A permeable barrier — a slatted fence, a woven hurdle, or a hedge trimmed to about 60–70 per cent density — filters the wind instead of blocking it, and protects a strip roughly three times its height.

Build shelter in tiers: low cushions and ground-cover plants, mid-height shrubs, and a taller boundary hedge. Plant it a few metres back from the plants you want to protect, and give it two or three seasons to knit together. Combined with deep roots, mulch and permeable paths, that layered approach will hold your soil in place through the worst the weather can throw at it.