Yarrow (Achillea millefolium), commonly known as yarrow or common yarrow, is a flowering plant in the family Asteraceae. It is native to temperate regions of the Northern Hemisphere in Asia, Europe, and North America.In antiquity, yarrow was known as herbal militaris, for its use in stanching the flow of blood from wounds.It contains isovaleric acid, salicylic acid, asparagin, sterols, and flavonoids.
It’s essential oil contains chemicals called proazulenes. The dark blue essential oil kills the larvae of the mosquito Aedes albopictus.
Yarrow is considered an especially useful companion plant, repelling some pest insects while attracting good, predatory ones.
In the Middle Ages, yarrow was part of a herbal mixture known as gruit used in the flavoring of beer prior to the use of hops.The flowers and leaves are used in making some liquors and bitters.
The herb is a diaphoretic, astringent, tonic,stimulant and mild aromatic.