Danewort is an herbaceous species of elder, native to southern and central Europe and southwest Asia. The name danewort comes from the belief that it only grows on the sites of battles that involved the Danes. The term walewort or walwort meant 'foreigner plant.' The plant's stems and leaves turn red in autumn and this may explain the link with blood. Since ancient times, it has been best known as a herb with healing properties. However, some parts of the plant are toxic, rendering its usage dangerous.