Achillea millefolium 'White' Yarrow

A long blooming perennial with flat heads of tiny white flowers above feathery almost fern-like foliage. Butterflies and bees love to drink its nectar and it is a host plant for many moths and beetles. There is some debate about the nativity of this species. Many sources agree that it is native across the Northern hemisphere, but most Achillea millefolium found in North America has hybridized with the Eurasian varieties.  A delicate looking but tough adaptable plant that spreads aggressively by rhizomes. It has been used medicinally for a variety of ailments.