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Rosinweed Sunflower

Silphium radula var. gracile

Other common name(s):

Slender Rosinweed

Family:

Asteraceae (Aster Family)

Plant Ecoregion Distribution Map

East Central Texas Plains, Gulf Coast Prairies and Marshes, Western Gulf Coastal Plain
Northern Post Oak Savanna, Southern Post Oak Savanna
Northern Humid Gulf Coastal Prairies, Texas-Louisiana Coastal Marshes
Flatwoods, Floodplains and Low Terraces3, Pleistocene Fluvial Terraces, Red River Bottomlands, Southern Tertiary Uplands

Plant Characteristics

Growth Form

Herbaceous

Height

2
to
3
ft.

Spread

.5
to
1
ft.

Leaf Retention

Deciduous

Lifespan

Perennial

Habitat and Care Requirements

Soil Type(s)

Sand, Loam, Clay, Well Drained, Dry

Light Requirement

Sun, Part Shade

Water Requirement

Low

Native Habitat

Grassland

Bloom and Attraction

Bloom Color

Yellow

Bloom Season

Summer, Fall

Seasonal Interest

Seeds, Nectar, Pollen

Wildlife Benefit

Butterflies, Birds, Bees

Maintenance

Use as a background accent in perennial garden or rocky hillside. Prefers good drainage but is tolerant of a variety of soils from sand to clay. Doesn’t like soil too rich or too wet. Propagation: Seed.

Comments

Blooms July-October. A tall perennial with 2-inch yellow flower heads. Several stems grow from the base, Leaves triangular, rough to the touch, aromatic when crushed. Has along taproot. Native Habitat: prairies. Attracts: birds, bees, butterflies.
Previous Scientific Name(s): Synonym/s: Silphium gracile, Silphium simpsonii var. wrightii

References

1) https://www.wildflower.org/plants/result.php?id_plant=SIGR4, 2) https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=780956#null, 3) http://bonap.net/TDC/Image/Map?taxonType=Species&taxonId=25441&locationType=County&mapType=Normal, 4) https://en.wikipedia.org/wiki/Silphium_radula, 5) https://w3.biosci.utexas.edu/prc/K12/pages/Silphium%20radula.html, 6) https://www.plantdelights.com/products/silphium-radula. 7) https://www.southcentralnatives.com/shop/p/silphium-radula-roughstem-rosinweed-1-gallon, 8) https://garden.org/plants/view/85237/Rough-stem-Rosinweed-Silphium-radula/

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State Office Phone: 830.997.9272

State Office Address:
Native Plant Society of Texas
PO Box 3017
Fredericksburg, TX 78624

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