Yarrow, also called Yarroway, Knight's Milfoil, Old Man's Pepper and various other common names, is a member of the daisy family that is native to Europe, Asia and North America.
Despite the astringent and bitter taste, the flowers were a popular salad herb and flavoring agent for liquors and beer in the 17th century. Today, yarrow flower is usually used to make infusions, tinctures and extracts.