The 18th-century botanical impresario Sir Joseph Banks was convinced that Britain's destiny was as the major civilising power in the world, and this could be achieved by harnessing botany and imperial progress to each other's mutual benefit.

Professor Kathy Willis talks to Linnaean Society honorary archivist, Gina Douglas, on how Britain's acquisition of Carl Linnaeus' collection of books and specimens proved the tool to promote, identify, and trade plants across the Empire.

She hears from Richard Barley, Director of Horticulture at Kew and former director of Melbourne's Botanic Gardens, who discusses Banks' influence on the choice of plants taken with the first settlers to Australia.

But how central were plants to Britain's colonial project? Historian Jim Endersby weighs up Joseph Banks' 18th-century vision to use Kew as a centre to gather as many plants and plant products as possible, not only to enrich the Royal Garden's collection but for Kew to also function as a botanical exchange house between the colonies.

Producer: Adrian Washbourne

Presenter: Kathy Willis is director of science at Royal Botanic Gardens at Kew. She is also professor of long-term ecology and a fellow of Merton College, both at Oxford University. Winner of several awards, she has spent over 20 years researching and teaching biodiversity and conservation at Oxford and Cambridge.