Episode 4

Prof Kathy Willis, Director of Science at Royal Botanic Gardens Kew, with an omnibus edition of her history of our changing relationship with plants from the early 20th century.

She examines new insights into plant hormones during the first few decades of the 20th century, the manipulation of which underpinned the perceived success of the so called Green Revolution; unlocking biodiversity through the creation of plant flora encyclopaedias - and their influence in conservation; the surprising benefits to emerge from the devastation wreaked by the great storm of 1987; what can be gained by preserving the diversity of plants through seed banking; the legacy of Arabidopsis - the first plant to have its entire genome sequenced.

Producer Adrian Washbourne.