More than 200 species of aster-like annuals, biennials, and perennials with daisy flowers make up this genus. Their forms vary widely, from very small alpine species growing only to a few inches to bushy species growing to several feet tall. Therefore, they fit a variety of garden situations, from rock gardens to borders, cut-flower gardens, and cottage gardens. Most species in this genus are native to North America.
Noteworthy CharacteristicsDaisy-like blooms over a long period that often attract butterflies. Good cut flowers.
CareNeeds soil that is consistently moist (but well-drained) in summer and full sun with some shade at midday. Alpine species need excellent drainage. Stake as needed and deadhead regularly. Divide every few years.
PropagationStart seed in a cold frame in mid-spring or late spring. Divide plants or root basal cuttings in spring.
ProblemsMildews, Bidens mottle virus, rust, white smut, leaf spots, Southern blight.