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This skill has been deployed in the curving glass Willis Faber building in Ipswich, which self-effacingly mirrors the surrounding buildings, and in the terminal at Stansted Airport, which nestles so low in the Essex countryside that it is invisible until you are on the approach driveway.

An even bigger surprise awaits as you drive through the lush Carmarthenshire countryside towards the new National Botanic Garden of Wales. The country lane gets narrower, more winding and more overgrown. Then, as you pass over the crest of one more hillock, you suddenly glimpse another that is blatantly artificial. It is of the same size and gently rounded shape as its grassy neighbours, if slightly lower. But there is no disguising its synthetic composition, as the clear glass panels that cover it gleam brightly in the sunshine. One can just imagine the glass roof silently parting in the middle to reveal a row of deadly intercontinental ballistic missiles.

In reality, the glass hillock contains nothing more sinister than a collection of Mediterranean plants. It is a conservatory, and a huge one at that. Measuring 95 脳 55 m on plan, it is the largest single-span conservatory in existence and will contain 10 000 plants collected from Mediterranean climatic regions across the world.

The interior of the great glasshouse is currently being landscaped by Gustafson Porter, the London practice set up by radical landscape architect Kathryn Gustafson of Seattle, winner of the international competition to re-landscape Crystal Palace Park in south London. This is Gustafson鈥檚 first built project in Britain: she was appointed after the botanic garden鈥檚 directors found British entries to their design competition too tame.

The glass dome and its contents are the centrepiece of the newly created botanic garden, which stretches across 230 ha of countryside, surrounded by another 136 ha of model organic farms. Before construction started in 1997, there was nothing on the site but a derelict 18th-century estate.

The venture was the idea of a local painter, William Wilkins, but has now been granted the standing of a national institution by the Welsh Office and is run by Professor Charles Stirton, formerly deputy director of the Royal Botanical Gardens, Kew. The garden cost 拢45m, of which 拢8.9m was absorbed by the dome and its landscaping; it received a Millennium Commission grant of 拢21.7m. It is due to open to the public next Easter.

Proclaimed as 鈥渁 new concept in botanic gardens鈥�, the National Botanic Garden of Wales is based on a vision of 鈥渁 world where we understand, value, use, enjoy and sustain plant life to create a balance of life on earth鈥�. Made of glass, steel and concrete, Foster鈥檚 great glasshouse may not be the most environment-friendly building in construction terms, but its rounded form certainly fits snugly into Carmarthenshire鈥檚 arcadian countryside.

鈥淭he brilliance of Foster鈥檚 design is how the building has been moulded into the ancient landscape of Carmarthenshire,鈥� enthuses the garden鈥檚 head of marketing, Gary Davies. 鈥淓specially since we live in a part of the world where builders are not allowed to use anything other than Welsh slate.鈥�

The interior of the dome is as much a surprise as its exterior. In contrast to the elliptical steel arches overhead, Gustafson Porter鈥檚 landscape has neither curving forms nor flowing lines. Instead of conventional mounds of earth, a jagged ravine some 6 m deep has been cut through the floor of the conservatory and lined with sheer sandstone walls.

Rather than trying to mimic nature, the man-made nature of the installation has been emphasised by the use of dressed stone, and the entire ground surface has been covered with a rough scree of crushed sandstone.

The ravine has been carefully angled to create areas of sunlight and shade, and waterfalls that will provide suitable habitats for a wide range of Mediterranean plants. The silvery-coloured sandstone is imported from Germany; even on a cloudy day, the effect is literally dazzling.

As for Foster鈥檚 enclosing dome, it is a simple building suited to the straightforward function of protecting this little offshore island of Mediterranean nature from the British weather. It is nothing more than a shallow, elliptical dome set at a slight angle of 7潞 to the horizontal, facing south towards the sun.

Designed by structural engineer Ove Arup & Partners, the glass dome is supported on a parallel series of steel cross arches that all share the same radius of curvature and cross-section.

The arches rise out of the elliptical rim in fairface concrete, which tilts up on the north face to accommodate a couple of narrow demonstration rooms and toilets, with staff and plant rooms in the basement below. The elements of the building have been distilled to their essence so that their combined effect is beautifully simple, elegant and without frills, which is only to be expected from Foster. The one special feature of the whole assembly is the exposed bearings at either end of the steel arches, many of which are within reach of visitors. These bearings take the form of ball-and-socket joints made of superbly finished, polished stainless steel.

The simplicity of design makes the dome appear deceptively small. It is only when you look across the landscaped floor of the glasshouse that you realise it is the size of a football pitch.

In sunlight, the arches create striking bands of shadow across the floor of the glasshouse.

Months before its full opening, the great glasshouse has been adopted as the venue for a series of garden design programmes to be broadcast on television in autumn. Although perhaps with less suspense than James Bond films, these programmes exploit the spectacle and glamour of Foster鈥檚 futuristic glasshouse and of Gustafson Porter鈥檚 dramatic landscaping inside.