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Common Yarrow (Achillea millefolium), a vigorous, summer-flowering, Eurasian perennial that has naturalised in many parts of the world. Although often considered a weed in its wild form, it has showy flowerheads that occur in a range of colours, as shown here, and it has given rise to many garden cultivars and hybrids. Yarrow also has many traditional herbal uses. Order: Asterales, Family: Asteraceae