Viburnum opulus is a deciduous shrub in the Adoxaceae family. Native to Europe, the plant is now naturalized in North America. Cramp bark has white flowers resembling snowballs and clusters of red berries. While the berries can be made into jam, the bark is often used in traditional European herbalism for its wellness supporting properties. Cramp bark is also referred to as guelder rose and is an important plant in Slavic folklore and art. The bark can be decocted, infused, or tinctured. Cramp bark is a large deciduous shrub growing as much as 15 feet (5 m) tall and 15 feet wide. It is native to the moist lowland forests of England and Scotland and naturalized to moist forests of the northern United States and southern Canada. The bark is stripped before the leaves change color in the fall, or before the buds open in the spring. A member of the honeysuckle family, cramp bark bears large white flowers, up to 5 inches (12 cm) across that yield red berries in the fall. 

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This information is for education purposes, and is not intended to diagnose, treat, cure, or prevent any disease. This information has not been evaluated by the Food and Drug Administration.