Ever wondered how people first discovered the highly specific uses of particular plants and herbs??? Looking closely at plants, we can learn a lot – about local habitat, climate, hydrology, wildlife, and soils. On the more mysterious side of herbalism, plants have their own language and way of existing with us on Earth. Doctrine of Signatures is known among scholars of ethnobotany and practitioners of herbal medicine and holds that plants have a “signature” — color, texture, shape, scent, the environment in which they grow — that resembles the organs and diseases they heal.