Carol takes a look at history and development of the water lily, a plant of unlikely economic importance, spiritual significance and artistic inspiration. She meets a leading experts in water-lily breeding to find out about a plant-insect relationship that brings about a dramatic overnight colour and sex change, and learns about its unique prehistoric pollinating system. She also visits South Korea and takes part in a festival held in honour of the lotus, a close relative of the water lily that is revered by Buddhist monks.