Tanacetum parthenium (feverfew) is a traditional medicinal herb which is commonly used to prevent migraine headaches, and is also occasionally grown for ornament.
The plant is covered by flowers reminiscent of daisies and grows into a small bush up to around 46 cm (18 in) high with citrus-scented leaves. It spreads rapidly, and they will cover a wide area after a few years. The species grows to up to 60 cms high.The leaves are variously pinnatifid with conspicuous flowers up to 20 mm across. The outer florets are all ligulate and white. The inner florets are yellow and tubular in lax corymbs.