Erigeron annuus, commonly known as annual fleabane or daisy fleabane, is a widespread wildflower native to North America. It is recognized by its numerous small, daisy-like flower heads with white to pale pink rays and yellow centers, borne on tall, branching stems. The name “fleabane” comes from an old belief that the dried plants repelled fleas and other insects. Unlike many similar species, Erigeron annuus can bloom over a long season, from late spring to autumn, and readily colonizes disturbed soils, roadsides, and meadows, making it a resilient pioneer in open habitats.