Silphium asteriscus

Common Names

Starry Rosinweed, Rosinweed

Summary

Starry rosinweed, Silphium asteriscus, is a native North American perennial forb in the Asteraceae family with short, stout rhizomes and upright stems reaching about 2 to 5 feet tall, forming clumps with alternate leaves and bearing bright yellow ray florets surrounding a central disk, arranged in terminal clusters or open panicles, flowering from May through September, a key distinctive feature is star shaped inflorescences and resinous stems, with ray florets numbering 13 to 17 per head and disk florets that are yellow, the plant attracts bees and butterflies and provides seeds for birds, contributing to pollinator friendly landscapes and wildlife value, native to the United States, it occurs across the eastern half of the country in habitats such as prairies, open woodlands, glades, and roadsides, cultivation favors full sun to partial shade and well drained soils, the plant tolerates drought once established and can be propagated by seed or division, with a tendency to self seed, in garden settings space plants about 2 feet apart and use in native or pollinator gardens and prairie type plantings for long bloom and wildlife value, since May through September flowering attracts bees and butterflies and seeds feed birds

Lifecycle

Perennial

Height

2-5 feet

Spread

12-24 inches

Hardiness Zones

Zones 8a-8b

Sunlight Requirements

Ideally Full Sun; tolerates Partial Shade.

Soil Type

Well-drained soil, preferably loamy or sandy, moderately dry to moist, with a pH around 6.0–7.0.

Soil Drainage

Well-drained

Soil pH

6.0-7.0

Bloom Color

Yellow

Bloom Time

Spring, Summer, and Fall, with possible winter bloom in mild temperatures.

Foliage Color

Green

Fall Foliage Color

Green

Leaf Lifecycle

Deciduous

Growth Rate

10-10 feet per year

Seasons of Interest

Spring, Summer, and Fall

Propagation Methods

Seeds, Division, Cuttings

Attracts Wildlife

Attracts bees, butterflies, other pollinators, birds