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The BBC Synopsis of this program:
It's the hottest July on record and staff at the Royal Botanic Gardens are getting hot under the collar. Scientist Steve Jansen is injecting dye into a tree in a bid to understand how it survives drought. Tony Hall is making a Mediterranean garden with plants that enjoy the high temperatures. Steve Robinson searches for dormice in the woodland at Kew's sister garden, Wakehurst Place in Sussex. And Lara Jewitt explores the sex life of the orchid in the Princess of Wales Conservatory.
Here is the Genre information as provided by BBC: