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(Silphium radula)
Rough-Stem Rosinweed

Host Species: Bordered Patch (Chlosyne lacinia) and Silphius Borer Moth (Papaipema silphiii)

Nectar Plant: many insects including other butterflies, bees, and wasps. Birds, enjoy the seeds in the fall.

Flower Color: yellow

Growth Habit: herbaceous perennial

Flowering Time: July to September

Range in North America: Mid-western and South-Central United States

Exposure: Prefers full sun

Hardiness: Zones 3-9

Soil Requirements: dry to medium well-drained soil, but can handle moist soil

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Rough-stem Rosinweed (Silphium radula)

Plants of rough-stem rosinweed (Silphium radula) in a prairie.

Rough-Stem Rosinweed (Silphium radula), a member of the Asteraceae (Aster Family), is a herbaceous perennial that grows from 1′ to 10′ tall and blooms with yellow flowers in the summer to early fall (July to September).  This plant grows in places with full sun that have dry circumneutral well-drained soils, but can handle moist soil and is hardy in zones 3-9.  More information on this species can be found on this blog post.

Hosted Species

Bordered patch butterfly (Chlosyne lacinia) on a yellow flower.
Bordered Patch Butterfly — Insects Unlocked from USA, CC0 1.0, via Wikimedia Commons

This species hosts the Bordered Patch Butterfly (Chlosyne lacinia) in the western part of its range and the silphius borer moth (Papaipema silphii), throughout.

Nectar Species

This species is a nectar source to other butterflies, skippers, bees, and wasps during the growing season.  Birds, such as goldfinch, like to eat the seeds in the fall.


This rosinweed grows in open areas such as prairies, roadsides, and riparian areas.

Range of Rough-Stem Rosinweed (Silphium radula) in the United States and Canada


Range map of rough-stem rosinweed (Silphium radula) in the United States and Canada.

Rough-Stem Rosinweed is native to the mid-western and south-central United States.

Origin of the Name

The genus name, Silphium, is derived from the Greek word that originated from a resin-bearing plant (Missouri Botanical Garden).  The species name, radula, is Latin for teeth, referring to the lower leaf margins.

Native Location

Arkansas, Kansas, Louisiana, Missouri, Oklahoma, Texas

USDA Plant Hardiness Zone

Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

Plant Habit


Exposure Requirements

Full Sun

Soil Requirements

Dry, Medium, Moist


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Rough-Stem Rosinweed”

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