The installation has been designed and overseen by head of the garden development unit at the Royal Botanic Gardens, Kew, Steve Ruddy.
"Most of the plants we have sourced or had grown in the UK, with the larger stuff coming from the continent," he told HW.
"We aim for a Chelsea standard of garden, but with a season of interest lasting all summer."
The installation took six months to plan and two weeks to install in the museum courtyard. It accompanies a season of exhibitions and events at the British Museum.
It is the fourth in a five-year programme of collaboration between Kew and the British Museum, which last year showcased the flora of South Africa.
Australia Landscape is free to visit until 16 October.