Sun/partial shade; perennial and nearly evergreen, with aromatic, fern-like foliage. The spring flower clusters are big and flat-topped, composed of tiny daisy florets. Each plant can spread up to 3 feet, forming dense mats.
Yarrow is cosmopolitan, native to much of the Northern Hemisphere, so endless colors and textures are available — including silver-leaved varieties for the evening garden. Taller plants may require staking. Plant in masses to attract butterflies.
Yarrow is said to thrive on neglect. It requires no special soil and can handle heavy clay, but does best in high dry spots. Allow soil to dry out completely between waterings. Deadheading will prolong the bloom; as a bonus, yarrow makes a good cut flower. Divide clumps every 2-3 years (and give to friends) if plants get too crowded.