Marrubium vulgare (white horehound or common horehound) is a flowering plant in the family Lamiaceae, native to Europe, northern Africa, and southwestern and central Asia. It is also widely naturalized in many places, including most of North and South America.
It is a grey-leaved herbaceous perennial plant, somewhat resembling mint in appearance, and grows to 25–45 centimetres (10–18 in) tall. The leaves are 2–5 cm (0.8–2.0 in) long with a densely crinkled surface, and are covered in downy hairs. The flowers are white, borne in clusters on the upper part of the main stem.