Ballota nigra is an herbaceous plant commonly known as black horehound, a member of the mint family. Synonyms for ballota nigra include Marrubium nigrum, Marrubium vulgare var. nigrum, and Sideritis nigrum. The plant is characterized by its dark green leaves, small purple flowers, and a strong, distinctive odor that is said to repel insects. Black horehound has a long history of medicinal use, especially in traditional European medicine. It has been used to treat a variety of ailments, including coughs, colds, and digestive issues. The plant is also used as a culinary herb, particularly in Mediterranean cuisine, where it is added to soups, stews, and herbal teas.