A bench facing the sea is a lovely thing to own and a punishing place to leave a cushion. Salt, strong light and wind that funnels along a coastal garden will age a cushion far faster than the same cushion would age in a sheltered courtyard. Getting it right comes down to three things: how quickly it dries, how well it holds its colour, and whether it will still be on the bench tomorrow morning.

Why coastal gardens punish cushions differently

Salt spray isn't just water. When it dries, it leaves salt crystals in the weave, and those crystals pull moisture out of the air, so the fabric stays slightly damp long after a shower would have dried. Add wind driving fine spray into seams and zips, and the cushion can be wet through in minutes on a day when the rain radar shows nothing at all.

Then there's the light. Sun bouncing off water and pale paving is harder on dye than sun falling on an inland lawn, so colours that fade gently elsewhere can go chalky in a season or two. Wind flexes the cover constantly, working at stitching and zips.

All of this changes your priorities. In a sheltered garden you might choose a cushion on looks first. On an exposed bench, drying speed and how the cushion fixes to the frame matter more than anything else.

Fabric: what survives salt and sun

The cover is the single biggest decision, and the label tells you more than the look of it does.

• Solution-dyed acrylic — the pigment goes into the fibre before it's spun rather than being printed on the surface. It resists fading, sheds light rain and copes with salt well. The most dependable choice for a coastal bench.
• Olefin (polypropylene) — light, cheap and very quick to dry, with good resistance to damp and mould. It can soften and pill after several seasons, so treat it as good value rather than a lifetime buy.
• PVC-coated mesh — water runs straight through, so it's dry within minutes. Stiffer and more functional-looking than woven fabric, but on a genuinely spray-soaked site it's hard to beat.
• Printed polyester — fine indoors or on a sheltered porch. On an exposed bench the print fades, the fabric holds water and it can turn musty if it stays damp. Best avoided.

Look at the underside as well as the top. A mesh panel or drainage eyelets let water out; a sealed cover traps it in. Hold the fabric up to the light — you want a tight weave with some body, not something you can almost see through.

Filling: the quick-drying question

The filling decides whether a soaked cushion is dry by teatime or still heavy next weekend.

Standard upholstery foam behaves like a sponge. Once water gets in, it can take days to work its way out, and a cushion that stays damp in warm weather is a cushion that will eventually smell. On a coastal bench, ordinary foam is the weak link in an otherwise good purchase.

Reticulated, or dry-fast, foam is what to look for. It's an open-cell foam with the cell walls removed, so water passes through instead of sitting inside. It dries in hours rather than days and keeps its shape, which matters on a bench that gets used daily. Hollowfibre is another option: quick to dry and light, but it flattens with use and shifts about in wind unless the cover fits closely.

On thickness, around 5cm suits most benches; 7cm to 8cm is more comfortable on slatted seats with a hard edge. Go much thicker and you're giving the wind more to catch and yourself more material to dry.

Colour and pattern on a salty bench

Salt dries to a pale film, and that film shows up worst on very light covers and on deep black. Mid-tones — slate blue, olive, warm grey, muted teal — hide the daily salt haze and the slow fade that creeps in over years. A subtle stripe or weave hides splash marks and pollen better than a flat plain fabric.

There's a comfort point too: dark covers get uncomfortably hot in direct sun, while very pale ones show every mark. Check that the cover is reversible, so you can rotate it and roughly double its working life.

Keeping the cushion on the bench in strong wind

Wind is the reason cushions end up over the hedge. A few details make the difference between a cushion that stays put and one that goes walkabout.

• Choose fabric ties or webbing straps over elastic loops. Elastic perishes in UV and goes slack within a season or two.
• Look for four ties rather than two, and check they're stitched through a reinforced patch, not a single thin seam.
• Tie around the slats or the seat frame where you can. A strap looped over a wide arm can simply slide along it.
• On a long bench, two shorter cushions are easier to carry in and out and present less surface area to a gust than one 180cm cushion.
• A non-slip mesh pad, or a few strips of grip tape on the slats, stops the cushion creeping forward without needing extra ties.
• If your bench sits in a real wind tunnel, plan to bring cushions in overnight through autumn and winter rather than testing the stitching.

A simple care routine that adds years

1. After rain, stand the cushion on its edge so water drains from the seams instead of pooling on the surface.
2. Once a month through summer, rinse the cover with fresh water to lift salt before it builds up.
3. Wash with lukewarm water and a mild soap, using a sponge rather than a stiff brush. Skip bleach, and keep cushions out of a hot tumble drier.
4. Dry flat or on edge in the shade, turning once, so both faces get air.
5. Store only when bone dry, in a cushion box or breathable bag. Sealed polythene traps damp and invites mould.
6. Check ties, zips and seams each spring, and re-stitch or replace anything that's fraying before the season starts.

Mould is the one thing worth being strict about. Small spots can often be dealt with promptly, but a cushion that still smells musty after a proper dry isn't worth keeping — especially if anyone sitting on it is prone to allergies or breathing problems.

Before you order

Measure the seat at its widest point and again at the front edge, then take the depth from the backrest to the front. Check whether your bench has a slight rake, as many wooden benches do; a wedge-shaped cushion sits better on a sloping seat than a flat one. Note where the arms or backrest posts limit the length, and remember ties and seams need a centimetre or two of allowance.

Order swatches if you can, and leave them outside in the spot the bench actually occupies for a fortnight rather than judging them indoors. Finally, buy for the windiest week of the year, not the calmest afternoon in June. A cushion that's a shade plainer, dries a little faster and is tied down properly will look better in three years' time than a prettier one that spent last winter in a heap against the fence.

Photo: Alexas_Fotos / Pixabay