The black haw is a deciduous shrub native to North America that grows up to 16 feet (5 m) tall. Its red berries ripen in August, and gradually turn blue through the winter. The root bark is collected in autumn, the stem bark in spring and summer.
Black haw is used to treat health problems caused by uterine contractions, including menstrual cramps and false labor pains. Black haw is a stronger uterine relaxant than cramp bark, and large or frequent doses may lower blood pressure. The herb is also included in herbal mixtures for treating asthma.
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