Garden Furniture Weather Test: Rattan, Teak, Metal & Plastic After 24 Months

Two British winters change garden furniture in predictable ways, and the changes are not evenly distributed across materials. Timber shifts colour and moves with moisture. Metal is decided entirely by its coating. Synthetic rattan is decided by the frame hidden inside it. Plastic is decided by ultraviolet exposure. Knowing which failure belongs to which material is the whole of the buying decision.

We have not run a controlled exposure trial and no published UK testing programme compares these materials over a fixed period, so no scores, percentages or survival rates appear here. This is a qualitative account of how each material behaves through British conditions, which are wet more than they are cold, and where the damage comes from repeated wetting and drying rather than from frost alone.

Key findings at a glance

• Moisture cycling, not low temperature, is the dominant weathering force in British gardens.
• Teak weathers to a silver grey while remaining structurally sound, and that colour change is cosmetic rather than a sign of deterioration.
• Powder coated aluminium does not rust, because aluminium forms its own oxide layer, while steel depends entirely on its coating remaining unbroken.
• Synthetic rattan fails at the frame far more often than at the weave, so the material of the frame is the specification that matters.
• Plastic furniture is vulnerable to ultraviolet embrittlement, which shows first as chalking on the surface and later as cracking at the stress points.
• Cushions and their covers deteriorate faster than any frame material and should be treated as a separate purchase with a shorter life.
• Standing water is the enemy in every category, which makes covers that trap moisture worse than no cover at all.

Timber: teak, hardwood and softwood

Teak contains natural oils that resist water penetration, which is why it has been used outdoors for so long. Left untreated, the surface oxidises and turns silver grey within the first season or two. This is a surface change. The timber beneath is unaffected, and the piece can be brought back to a honey tone with a proprietary cleaner and restorer if the colour matters to the owner.

What does affect teak is movement. Timber expands and contracts with moisture content, and in Britain that cycle runs all year rather than seasonally. Small surface cracks along the grain, known as checking, are normal and do not compromise the joint. Fixings can loosen over two seasons, and a single check of the bolts each spring prevents the wobble that people mistake for structural failure.

Other hardwoods behave similarly but with less natural oil, so they benefit more from treatment. Softwood garden furniture, usually pressure treated pine, is a different proposition: the treatment protects against rot but not against movement or surface degradation, and these pieces need recoating to keep their appearance. Softwood left in permanent contact with wet ground will fail at the feet first, which is why placing any timber furniture on paving rather than on soil or grass extends its life considerably.

Metal: aluminium, steel and iron

Aluminium is the material that most reliably survives British weather with the least attention. It forms a stable oxide layer, it does not rust, and a powder coated finish over it resists chipping. It is also light, which is an advantage for storage and a disadvantage in wind, since lightweight chairs move in a gale and end up damaged against a wall or a fence.

Steel is stronger and heavier, and it is entirely dependent on its coating. Galvanised and powder coated steel performs well until the coating is breached. Once it is, water reaches the steel and corrosion spreads underneath the coating from that point outwards. The common breach points are the feet, where chairs are dragged across paving, and the fixing points where bolts pass through. Touching up a chip when it appears is a genuinely effective intervention.

Cast iron is durable and immovable, which suits a permanent bench position. It rusts at the surface readily and is usually painted, and the maintenance cycle is repainting rather than protecting.

Synthetic rattan and plastics

Synthetic rattan is a woven polyethylene strand over a frame. The weave itself is generally stable and ultraviolet stabilised in decent quality products, and it sheds water rather than absorbing it. The failure point is almost always the frame beneath. An aluminium frame will outlast the weave. A powder coated steel frame will perform well until the coating is broken, and then it will corrode from the inside where it cannot be seen or treated. A plain uncoated steel frame in a cheap set is the reason so many rattan sofas sag after two seasons while the weave still looks new.

The other weakness is the strand ends and the points where the weave is fixed to the frame. Repeated flexing under weight works these loose, and once a strand unravels the repair is difficult.

Moulded plastic furniture is defined by ultraviolet exposure. Polypropylene and similar plastics lose plasticisers under sunlight, and the surface develops a chalky bloom. The material becomes progressively more brittle, and the failure appears at the stress concentrations, typically where the leg meets the seat. A stacked set stored out of the light will remain serviceable far longer than the same set left on a terrace all year.

Material behaviour after two British seasons

The table below describes observed behaviour and maintenance requirements by material. It deliberately contains no scores or lifespans, since neither is published or measured.

Material	Typical change after two seasons	Structural risk	Maintenance that works	Winter handling
Teak	Silver grey surface, fine grain checking	Low, joints stay sound	Annual clean, check and tighten fixings	Can stay out, keep off wet ground
Other hardwoods	Colour fades, surface roughens	Low to moderate	Clean and re oil each spring	Cover loosely or store
Treated softwood	Greying, raised grain, possible warping	Moderate, worst at ground contact	Recoat annually, keep feet off soil	Store under cover where possible
Powder coated aluminium	Very little visible change	Low	Wash down, touch up chips	Stack and secure against wind
Powder coated steel	Sound unless the coating is chipped	Moderate once breached	Inspect feet and bolts, touch up promptly	Store dry, keep feet off standing water
Cast iron	Surface rust where paint has failed	Low, mass carries it	Wire back and repaint affected areas	Stays in place, it will not move
Synthetic rattan, aluminium frame	Weave holds, minor dulling	Low	Rinse the weave, check strand ends	Cushions in, frame can stay out
Synthetic rattan, steel frame	Weave holds, frame may corrode unseen	Moderate to high	Keep water out of open tube ends	Store under cover
Moulded plastic	Chalky surface bloom, colour fade	Moderate, brittleness increases	Wash, store out of direct sunlight	Stack and store indoors
Outdoor cushions	Fade, damp retention, possible mildew	Not structural	Dry fully before storing, never bag damp	Indoors, always

What this means for UK homes

Buy on the frame, not on the finish. For synthetic rattan this is the single most useful rule available: ask what the frame is made of, and treat an aluminium frame as the difference between a set that lasts and one that sags. Our modern garden furniture UK range is selected on that basis.

Ventilate rather than seal. A cover that traps moisture against a surface causes more damage than rain does, because the material never dries. Covers with vents, raised off the furniture rather than shrink wrapped onto it, are the ones worth using, and in a wet week no cover at all is preferable to a sealed one.

Lift furniture off wet ground. Feet standing in a puddle on a patio is how timber rots and how coated steel corrodes, and a few millimetres of clearance from a glide or a paving slab prevents both. In gardens with a lawn position, moving the pieces onto hard standing for the winter achieves the same thing.

Treat cushions as consumables with their own storage plan, and bring them in whenever they will not be used for a few days. A dry store is the whole requirement. Beyond that, choose the material for the position: a permanent focal point suits timber or cast iron, a terrace that is cleared each autumn suits aluminium, and a small courtyard that needs stacking suits lightweight designs. Those distinctions run through garden dining sets UK, garden benches UK and garden storage UK alike, and the full collection is at Furniture in Fashion.

Methodology

This report was compiled in 2026 from our editorial assessment as a UK furniture retailer and the established physical properties of the materials discussed, including the corrosion behaviour of aluminium and steel, the natural oil content of teak and the effect of ultraviolet exposure on common plastics. It is not a controlled exposure trial. No scores, lifespans, survival rates or comparative test results appear here because no published UK testing programme provides them, and we have not conducted one. The report does not include proprietary sales data or survey fieldwork.

Citing this report

Journalists and websites may cite this analysis with credit to Furniture in Fashion and a link to the report published in 2026. It describes how garden furniture materials behave in British conditions in qualitative terms and does not claim to be laboratory testing. Further comment on outdoor materials and maintenance is available on request.

Frequently asked questions

Can teak garden furniture be left outside all year in the UK?

Yes, provided it is not standing on permanently wet ground. It will weather to a silver grey, which is a surface change rather than deterioration, and can be restored with a cleaner if the original tone is wanted.

Does synthetic rattan last in British weather?

The weave usually does. Whether the set lasts depends on the frame inside it, since an aluminium frame will not corrode while an uncoated or chipped steel frame will rust from within and cause the seat to sag.

Should I cover garden furniture in winter?

Only with a ventilated cover. A sealed cover traps moisture against the surface and keeps it permanently damp, which causes more harm than rainfall on an uncovered piece.

Why has my plastic garden furniture gone chalky?

Ultraviolet exposure degrades the surface of the plastic, producing a chalky bloom and gradual colour loss. The material also becomes more brittle over time, so cracks appear at stress points such as the leg joints.

What is the lowest maintenance garden furniture material?

Powder coated aluminium. It does not rust, it needs little more than washing down, and it is light enough to store easily, though it needs securing in strong wind for the same reason.