Achillea, commonly known as Yarrow, is a genus of more than 100 species of flowering plants. yarrow has flat-topped or dome-shaped clusters of small white flowers. This plant usually grows between 30 and 90 cm (1 to 3 ft ) in height. Achillea(Yarrow) comes in a wide range of colors including white, cream, yellow, purple, orange, pink and red. It will well grow in drained soil, with a PH between 5.5 and 7.0.