Achillea ageratum
Achillea ageratum, also known as sweet yarrow, sweet-Nancy, English mace, or sweet maudlin, is a flowering plant in the sunflower family. it was originally native to Switzerland, before spreading across Europe (to Portugal, Spain, France, England, Belgium, Germany, Italy, Croatia and Romania), and Morocco. In the United States the plant is cultivated in the state of New York for its pleasant fragrance and sparingly naturalized in a few places outside its native range.

In the Middle Ages it was used as a strewing herb to repel insects such as moths, lice and ticks and spread a good smell in private rooms. The leaves can be chopped and used raw as a herb, or added with other herbs to soups and stews. Modern uses of the herb include its use as a flavouring, as a dried flower, and as an ornamental herb.

The species was first given a species name by Carl Linnaeus and published in his Species Plantarum 1753. Achillea is a reference to the Greek hero Achilles, who was trained to used herbs by his mentor, the centaur Chiron. The flowers last for a relatively long period, hence the inclusion of ageratum in the species name.

The plant grows to a height of . A hardy perennial, it can be identified by its narrow and serrated leaves, and clusters of small, cream-coloured flowers.

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ageratum
Plants described in 1753
Taxa named by Carl Linnaeus
Garden plants