Annual fleabane
Also known as
Daisy fleabane, Eastern fleabane, Fleabane
Keep this plant’s care guide close at hand.
Get the appAbout Annual fleabane
Erigeron annuus, commonly called annual fleabane, is a North American native wildflower in the aster family bearing airy sprays of small, daisy-like blossoms. Plants typically reach 30–100 cm tall with branching, hairy stems and alternate leaves; basal leaves are larger and spoon- to lance-shaped, while upper leaves are narrower and often sessile. Numerous flower heads, about 1–2 cm across, feature many fine, threadlike white rays that may age pink or lavender, surrounding a golden-yellow disc. Blooming from late spring through fall, it provides a long nectar window for bees, hoverflies, and small butterflies. It thrives in full sun to light shade and in a wide range of soils, often colonizing disturbed sites. Although usually annual, it may behave as a short-lived biennial, forming a rosette the first year and flowering the next. Prolific wind-borne seeds lead to self-sowing, making it a useful, low-input meadow species but potentially weedy where unmanaged.
Taxonomy
Properties & Requirements
How to care for Annual fleabane
Water
Water newly planted fleabane weekly for the first 2–4 weeks to establish roots, allowing the top 2–3 cm of soil to dry between waterings. Once established in the ground, it tolerates periodic drought and typically needs water only during extended dry spells. In containers, water thoroughly when the top 2–3 cm are dry, letting excess drain; do not leave the pot standing in water. Avoid chronically wet soils, which promote weak, lanky growth and root stress.
Light
Full sun (6+ hours daily) produces the most abundant, compact flowering. The plant also tolerates light to partial shade, especially in hot climates, though shade can lead to taller, looser stems and fewer blooms. In regions with intense afternoon heat, a few hours of late-day shade helps maintain flower quality and reduces water demand. Avoid deep shade, which encourages weak growth and may suppress flowering altogether.
Nutrients
This species prefers lean to average soils and generally needs little to no fertilizer. Overfeeding, especially with high nitrogen, encourages floppy growth and fewer flowers. For garden cultivation, work in a thin layer of compost in early spring to boost soil life. Container-grown plants can receive a balanced, dilute fertilizer (e.g., 10-10-10 at 1/4–1/2 strength) monthly during active growth. Avoid continuous-release high-N formulations and stop feeding late in the season to prevent soft, lodging-prone stems.
Temperature
Best growth occurs in cool to warm conditions around 10–27°C. Plants tolerate summer heat if soil moisture is adequate and can withstand light frosts; in mild climates, rosettes may overwinter and flower the following season. As an annual or short-lived biennial, it is broadly adaptable across temperate zones. Protect container plants from hard freezes that can heave roots, and provide airflow in heat waves to limit mildew or stress-related lodging.
