Commonly known as Yarrow, Achillea are reliable, hardy, long-flowering herbaceous perennials producing an abundance of flowers in a range of bright and pastel colours from summer through autumn. These stalwarts of the flower garden have beautiful, architectural forms with aromatic, silvery-grey or green foliage that has a finely dissected, fern-like appearance. Growth habits range from low-growing mat-forming varieties to taller specimens reaching up to around a metre high. Achillea plants are pest and disease free and require little attention once established, other than dead-heading regularly to extend the flowering period. The legend goes that Achillea plants originally sprang from the blood of the hero Achilles after the siege of Troy.