Yarrow has a pungent odor similar to mothballs.  "Blooming in May, yarrow is most identified by its flat-topped cluster of  small white to pink flowers."  The leaves of yarrow are feathery.  The stems are very hairy.  Yarrow is not edible and it is a medicine.  

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    It is native to temperate regions of the Northern hemisphere in Asia, Europe, And North America.  It has been introduced as a feed for livestock in places like New Zealand and Australia. However it is a weed in those places.  Yarrow can be found in many places.   Numerous tribes in North America used  Yarrow for a variety of ailments.  

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     Yarrow is not edible because yarrow may cause dermatitis to humans with sensitive skin.

But Yarrow's dried flowers and leaves are used as an ingredient for cold remedies.  Yarrow acts as an expectorant and is used to promote sweating.  The fresh leaves of yarrow can be rubbed on skin as an insect repellent.  

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    Achillea millefolium a.k.a yarrow is an old traditional remedy for bloody diarrhea and dysentery.  Yarrow's affinity for the blood and circulation can be seen internally well as externally.  Yarrow has been used to treat high blood pressure, or ten combined with hawthorn and Lime blossom and it has a reputation for being able to prevent blood clots.