Why timber needs a little attention in a British garden

Wooden garden furniture earns its keep. A teak bench that has weathered twenty summers, a folding oak table hauled out for every barbecue, a set of acacia chairs that live outside all year — they all ask for the same thing: a small amount of care, timed well. Our climate is the challenge. Rain, damp air, sharp frosts and long grey spells do more damage to timber than heat ever will, and the sun that finally arrives bleaches exposed grain to a silvery grey. None of this has to mean replacement. An afternoon's work each spring and autumn will keep good timber sound for decades.

Spring: clean gently and inspect thoroughly

Choose the first settled dry spell in spring, when the furniture has dried out after winter. Start by brushing off leaves, cobwebs and grit with a soft hand brush, then wash the whole piece with warm water and a little mild washing-up liquid or a dedicated wood cleaner.

• Use a stiff nylon brush for grain and joints — never a wire brush, which gouges the surface.
• Skip the pressure washer entirely. It forces water deep into the grain, lifts fibres and loosens glued joints.
• Rinse with clean water and leave the furniture to dry for a day or two before doing anything else.
• Check every joint, dowel and bolt. Tighten fixings and note anything that has worked loose over winter.
• Look for soft, dark or crumbly patches — the first signs of rot — and for fine dust and tiny holes, which suggest woodworm.

Address problems now, while the wood is still dry enough to take a repair. A cracked joint is far easier to deal with in April than in July.

Sanding rough areas and tackling small repairs

That grey, silvery surface is weathered timber, not necessarily damaged timber. The fibres have broken down at the surface while the wood beneath remains perfectly sound. Sanding brings the colour back. Work with the grain, starting with a medium 120-grit paper and finishing with 180-grit, and use a sanding block on flat surfaces so you do not round off crisp edges.

For deeper marks, fill with an exterior-grade wood filler matched to the timber, let it set, then sand flush. If a joint has rotted, treat the affected area with a suitable wood preservative before refinishing, and replace any fixing that has rusted. Wear a dust mask while sanding, and brush the piece down thoroughly afterwards — dust left in the grain will stop any finish from soaking in evenly.

Oil or stain? Choosing the right protection

Both approaches work; they simply do different jobs. Oils such as Danish oil, teak oil or boiled linseed oil soak into the timber and feed it from within, deepening the natural colour and leaving a soft, matt finish. They suit hardwoods like teak, iroko, eucalyptus and acacia, and they let the wood's own character show through. The trade-off is that oil wears away and needs renewing more often.

Stains and coloured wood protectors sit closer to the surface, adding pigment that shields the timber from ultraviolet light as well as moisture. They last longer, offer a broader choice of tones, and are often the better bet for softer woods such as pine or spruce, which benefit from the extra colour and defence. Whatever you choose, avoid outdoor varnish on furniture that lives outside. It looks lovely for one season, then cracks, peels and traps water beneath the film.

Applying oil or stain properly

Wait for a dry day with the temperature at 10°C or above, and work out of direct sunlight — strong sun makes the finish dry too quickly and streak.

• The timber must be dry. Damp wood will not absorb oil evenly.
• Apply with a good-quality brush or a lint-free cloth, working along the grain in thin coats.
• Leave for twenty to thirty minutes, then wipe away any excess before it turns tacky.
• New or very dry timber usually wants two coats; established furniture generally needs just one top-up a year.
• Lightly sand with fine paper between coats and buff the final surface.

One safety note worth remembering: oily rags can self-combust. Spread them out flat to dry outdoors before binning them, never bundled up in a shed.

Summer, autumn and winter: keeping timber protected year round

Through summer, the small habits matter. Wipe up spills and drips, use coasters under glasses and pots, and never let water sit in the hollows of a table top — standing water is what turns a finish milky. A simple test tells you when the wood wants feeding: drop a little water on the surface. If it beads, protection is holding; if it soaks straight in, it is time to oil.

Autumn is the moment to oil or stain before the wet months arrive, so the timber goes into winter with a fresh barrier in place. Raise furniture off paving and grass using feet, bricks or a pallet, and clear fallen leaves rather than leaving them to hold damp against the wood. Covers should be breathable — a plastic tarpaulin traps condensation and does more harm than good. Store cushions, parasols and anything fabric in a dry shed or garage.

During long wet spells, check pieces monthly and after storms. Wipe mould away with a diluted vinegar solution, rinse and dry. Come late winter, inspect for frost damage and any lifted finish, and you will be ready to start the cycle again — a bench that lasts a generation and more.