Helianthus atrorubens

Helianthus atrorubens in bloom in a dry meadow of the southeastern United States
Helianthus atrorubens

Perennial of the Asteraceae family, native to the southeastern United States, where it grows in open woods, forest edges, and dry to semi-shaded meadows, mainly in the southeastern states — Georgia, Carolina, Alabama, Tennessee. It favors well-drained soils, often sandy or slightly acidic, under filtered light or full sun depending on the location.

It is an upright and vigorous plant, reaching 1.20 to 1.80 meters in height, with sturdy stems, often tinged with dark purple at the base — precisely what the epithet atrorubens, "dark red," suggests. The lower leaves are large, oval, rough to the touch, borne on long winged petioles; the upper leaves are smaller and sessile.

The flower heads are borne in loose panicles at the top of the stems: the ligules are a bright and vivid yellow, arranged around a dense and domed dark purple-brown central disk, which is the most immediately recognizable distinctive feature of the species. In its natural habitat, its flowering extends from September to November. In cultivation, it generally occurs from August to October, usefully extending the season of large perennials.

It requires ordinary well-drained soil, in full sun to light partial shade, and tolerates periods of moderate drought once established. Its large size makes it suitable for background borders, naturalistic compositions, and prairie gardens.