Originally, feverfew was a native plant of southeastern Europe, but is now common throughout Australia, Europe, and North America. It is a moisture-loving perennial, and in the photo is my personal plant in year 2 (so it can certainly survive a Midwest winter). It can grow up to 2 feet (60 cm) tall, and white flowers with yellow centers that bloom all summer long – which makes it an attractive border plant. It is usually free from pests and diseases, and in fact is historically known as a plant that repels undesirable insects.
The aboveground parts (leaves, flowers, etc..not roots) that are used in herbal medicine. Since the first century, feverfew has been used in the treatment of headaches, as well as used for treating inflammation, arthritis, menstrual discomforts, fever, and other general aches and pains. It has been show that feverfew stops white blood cells from absorbing the amino acid thymidine, which reduce the rate of inflammatory chemical (leukotriene) production as well as fatty acid byproduct production which are essential to the production of those leukotrienes. This is a benefit to those suffering from lupus or rheumatoid arthritis.
For those who suffer from migraines, feverfew is thought to reduce the production of seratonin. Seratonin is involved in the constriction of blood vessels and the release of pain-causing chemicals. A clinical trial in England found that taking feverfew for four months reduced the frequency and severity of migraine attacks, as well as reducing the accompanying vomiting and visual distortion. However, the duration of the migraine was not affected.
Human consumption: If you want to take feverfew as an herbal remedy, it should be consumed in a capsule form of the freeze-dried herb. People who are allergic to ragweed maybe be allergic to this herb as well. Pregnant women should avoid taking feverfew as it can cause uterine bleeding. Nursing mothers should also avoid taking feverfew because its active components can be transmitted through breast milk which may cause allergies in the child. If you are on any blood-thinning medication, such as warfarin (Coumadin), you should not take feverfew. Though there are no reports of detrimental interaction with this class of drugs, it is theoretically possible. Fresh leaves may cause dermatitis and mouth ulcers if eaten, so be cautious.
On another note, the flowers are often used for crafts and in floral arrangements.