The orchid garden in terminal two is the oldest garden. Revamped in 2002, 2005 and this year, it features 6000 Asian, African and American tropical plants, of which 30 per cent are native to Singapore. It's a stunning display where flowers jostle for attention with koi-filled ponds, miniature waterfalls and fountains, cascading foliage and driftwood sculptures.
Terminal two is also home to the architecturally inspired bamboo garden, which was unveiled last year. There are five species of bamboo and - lest you think it's all straight lines and seriousness - giant soft toy pandas. You can also visit the terminal roof, where there's a dazzling sunflower garden. It was recently revamped to include lighting fixtures so at night it becomes a light-themed mini park.
Both terminals two and three have cool green fern gardens that include giant Tasmanian tree ferns, which can grow up to 15m. In the terminal three baggage claim area there's a five-storey "green wall" of more than 10,000 plants arrayed across a 300m wide space. It's one of the largest indoor vertical gardens in Singapore.
Terminal three's butterfly garden is the first butterfly garden in an airport. Think high humidity, abundant greenery - there's 8000 plants here - and splashes of colour, and a 6m grotto waterfall with hundreds of butterflies darting around. It's the perfect place to keep children entertained.
A heliconia display in terminal one has more than 20 species of the flowering plant and the cactus display features more than 3000 plants from Asia, Africa and America. It takes on a decidedly prehistoric appearance, no doubt encouraged by spectral steel sculptures.
A unit of 11 specialists and a team of contract workers painstakingly develop and maintain the gardens. Plants are grown in an off-site nursery and bred specially for indoor conditions.
* New Zealanders travelling to Singapore can take advantage of a stopover holiday. This bundles accommodation, transport, and free admission to a range of attractions from NZ$37 a person. Gardens by the Bay is an included attraction and those who purchase this holiday get complimentary admission for two to Gardens by the Bay.
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Getting there: Singapore Airlines flies 12 times weekly from Auckland to Changi, current airfares start at $1484 return.