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The World’s most advanced greenhouse is made from the World’s leading long life wood, Accoya. This timber is guaranteed to perform and dimensionally stable whatever the weather conditions.

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Outstanding Performance

Accoya is a wood for the future. The outstanding performance benefits of Accoya are best realised in exterior applications such as our greenhouses. Accoya is modified by a process of acetylation to give it a long life. This process alters the wood at a molecular level. This modification is not evident on inspection of the timber but becomes apparent in the durability and performance of the wood over time. Accoya has been given a class 1  rating for durability, it doesn't get any better than that. It surpasses, even teak. Virtually rot proof you can be assured of the longevity of Accoya with institutions like TRADA stating that Accoya has a 70 year minimum service life. Additionally it has been independently assessed by research institutes across the world, including BRE and Napier University in the UK. Perhaps that's one of the reasons that Accoya has a 50 year guarantee for use outside.

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Welcome to the 21st Century

Green Credentials

  • Sustainably sourced from FSC,and PEFC Forests, it is a naturally renewable resource with green credentials.
  • Accoya is 100% non-toxic and easily recycled.
  • There is no need to apply chemical preservatives to Accoya.

Consistent Quality

Each batch of Accoya is subject to stringent tests to ensure quality from surface to core:

  • Tested to determine decay resistance.
  • Tested for dimensional stability.

Natural Beauty

At Cultivar we love wood, it brings warmth and character to our greenhouses. Accoya is naturally beautiful and offers something to our greenhouses that you will not find in others.

Dimensional Stability

The more dimensionally stable a wood the less susceptible it is to warp or twist. Accoya matches and in most instances exceeds the stability and performance of some of the very best tropical hardwoods making it well suited for use outdoors. As a consequence it is very popular for use outdoors where high performance is required. Less shrinkage and swelling will ultimately lead to a trouble free service life for your greenhouse.

Thermal Efficiency

Accoya is 30% more thermally efficient than typical hardwoods. In a greenhouse environment thermal efficiency matters. A thermally efficient structure will be cooler on hot days and warmer on cool days, providing a more comfortable working environment for you and better growing conditions for your plants.

Read about Ventilation


The longevity of wood is measured on a scale of durability. Accoya has the highest rating for durability, a Durability Class 1, which puts it ahead of species such as European Oak, Western Red Cedar and Iroko. An example of another wood with a durability of Class 1 is Teak.

Unlike ordinary woods every batch of Accoya is tested prior to being dispatched to ensure a consistent quality is achieved. This, perhaps, is one of the reasons Accoya are able to guarantee their wood for fifty years when being used outdoors. Not that it applies to our greenhouses but Accoya also guarantee their wood for 25 years when put in the ground.

To retain the newness we choose to brush the Accoya with a light translucent coating to ensure it reaches you in good condition. A further demonstration that we go the extra mile to ensure our greenhouses stand head and shoulders above the rest. Performance aside Accoya is sustainably sourced and FSC certified, so it has green credentials too.

Read about Staging and Shelving

Accoya and its features

When your greenhouse is delivered you will note the generally light blond nature of this treated timber. You will also see it is remarkable clear of imperfections such as knots. However like all natural products it will have surface markings and signs of resin reaching the surface. Some of the timbers may display a darker face which is normal and should not cause concern.

What happens next

Your greenhouse timber will over time have achieved an attractive grey patina. There is however a process during which greying may be patchy, this depends not only on the natural facility of the treatment but also on the location and the conditions in which the greenhouse sits, this may be particularly true in shady areas, on the north face or adjacent to hedges. All timbers exposed to exterior conditions and also untreated with paints or stains can be degraded by a combination of ultra violet light and naturally forming algae, mildew and pollution and Accoya is no exception. However the preservation process to which Accoya is subjected will ensure that despite these occurrences the integrity and the longevity is unaffected.

As time goes by

The gradual greying will in time merge into a more even finish. You can remove or restrict some of the uneven patchiness by simply washing down the timber with a soft brush or cloth and warm soapy (washing up liquid) water. There is also a surface treatment that we can recommend which if you choose can be applied. This is a blend of natural oils including : sunflower oil, soya oil, thistle and linseed oil and this is called Osmo UV Protection Oil in the 420 Clear Satin finish. This will slow down the aging process.