Feverfew (Tanacetum parthenium) is a traditional medicinal herb which is found in many old gardens, and is also occasionally grown for ornament. The plant grows into a small bush up to around 46 cm (18 in) high with citrus-scented leaves, and is covered by flowers reminiscent of daisies. It spreads rapidly, and they will cover a wide area after a few years. Feverfew was native to Eurasia, but cultivation has spread it around the world and it is now also found in Europe, the Mediterranean, North America and Chile. It is also sometimes referred to as bachelor's buttons or featherfew.