In ancient Greece, physician-philosophers were struck by how many plants looked like a body part. They wondered if nature was trying to tell them something. From this observation, they developed the ‘doctrine of signatures’—a claim that certain plants could heal the organ that they resembled of an illness. It may seem like nonsense, however, says nutritionist Jane Hutchens of Lemongrove Road Holistic Health in Penrith, it’s not so far-fetched. Two thousand years ago there was no division between the sciences as we understand them today and other areas of enquiry such as medicine, philosophy and astrology. Early physicians like Dioscorides (40–90AD) and Galen (129–200AD) knew that plants had medicinal and health properties. They understood that prescribing the right plant for the right ailment was a task made easier by the appearance of the plant—the ‘signature’ (distinctive mark) of the illness or organ could be matched to the ‘signature’ of the plant. “For example,” says Jane, “plants with yellow flowers, like gentian and dandelion, would be used to treat conditions that caused jaundice (yellowing of the …