The largest glasshouse at the Royal Botanic Gardens in west London is home to 17,000 plants - but is out of bounds to the public.

Here - during Kew's 250th anniversary year - have a look around with team leader Nick Johnson, and see the scientific collections that paying visitors do not normally get to see.

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Music: Sunflowers composed by James McNair and Daniel Teper.
Slideshow by Paul Kerley. Publication date 13 February 2009.

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