Mentha pulegium is an herbaceous perennial in the mint family native to Europe, North Africa, and the Middle East. Pennyroyal is known for its intense aromatics and has a history of use since ancient Greece for its beneficial properties. Pennyroyal leaf can be used with a light hand as a flavoring agent in herbal teas and in cooking. Also spelled penny royal, the herb should be used with caution and respect.

Pennyroyal is the smallest of the mint family and has some very distinctive properties. The taste and odor are stronger and far more pungent than other mints, making it a strong herb to some. Pennyroyal is a good herb to plant in gardens to keep bugs away.