Achillea ageratifolia, the Balkan yarrow or Greek yarrow, is a species of flowering plant in the daisy family Asteraceae, native to Greece and Bulgaria. Growing to 20 cm (7.9 in) tall and broad, it is a compact herbaceous perennial. It is a highly variable species, with three recognized subspecies. They have erect, simple, somewhat woody based stems. The narrow grey-green foliage resembles that of a related genus Ageratum, hence the Latin specific epithet ageratifolia. The solitary, daisy-like composite flower heads are white with yellow centres and about 2-3 cm across. They appear May-July in the northern hemisphere.