Erigeron glaucus is a species of flowering plant in the daisy family known by the common name seaside fleabane, beach aster, or seaside daisy. This wildflower is native to the coastline of Oregon and California where it grows on beaches, coastal bluffs and dunes. This is a perennial daisy reaching heights between 5 and 30 centimeters with branching, nodding stems which may be hairy and hairy to hairless. It grows from a stout rhizome and produces thick, firm, rounded to spoon-shaped leaves, sometimes with a few teeth along the edges, each two to 13 centimeters long. Its stems bear flower clusters of one to 15 flower heads which are variable in size from one to over three centimeters wide. The centers contain golden yellow disc florets and the edges are fringed with ray florets which may be long or quite short, and are shades of deep blue and purple to lavender to nearly white. While typical habitats include coastal bluffs, one highly specialized plant association is found within the two Cupressus macrocarpa dominant forests in Monterey County, California. This is a great plant for coastal gardens, and produces beautiful and abundant flowers most of the year. Tolerant of recycled water. No supplemental irrigation is needed when planted in its native plant community, but more irrigation is needed when planted inland or in containers. Great container plant. Many cultivars available.