Silphium terebinthinaceum Jacq.
Prairie Rosinweed, Prairie Dock
Asteraceae (Aster Family)
USDA Symbol: SITE
Very large, wide, spade-shaped basal leaves subtend a 3-8 ft. flowering stalk. Bright yellow, composite flower are numerous on older plants.
The common name for Silphium is rosinweed due to the copious resin exuded from injured parts of the plant.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Size Notes: Up to about 8 feet tall.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug , Sep
DistributionUSA: AL , AR , DC , GA , IA , IL , IN , KY , MI , MO , MS , NC , OH , SC , TN , VA , WI , WV
Native Distribution: S. Ont. & OH to MN, s. to SC, MS & AR
Native Habitat: Prairies; woodland borders; old fields
Growing ConditionsLight Requirement: Sun
Soil Moisture: Moist , Wet
Soil Description: Wet to mesic soils.
BenefitUse Other: The common name for Silphium is osinweed' due to the copious resin exuded from injured parts of the plant. Prairie youngsters use the resin for chewing gum. It tastes like carrots and pine. (Lamb/Rhynard)"
Value to Beneficial InsectsSpecial Value to Native Bees
Special Value to Bumble Bees
Provides Nesting Materials/Structure for Native Bees
This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.
PropagationDescription: Propagate by sowing seed sowing unstratified seed in fall or stratified seed in spring. If producing transplants, sow seed late in the season as the rapid taproot growth will enable transplanting in fall or early spring.
Seed Collection: Collect in Sep. and Oct.
Seed Treatment: Moist stratification for 10 days.
Commercially Avail: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
View propagation protocol from Native Plants Network.
National Wetland Indicator Status
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
Native Plant Center at Westchester Community College, The - Valhalla, NY
Native Seed Network - Corvallis, OR
Mt. Cuba Center - Hockessin, DE
BibliographyBibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally
Bibref 1262 - Plants of Carolinian Canada (1994) Lamb, Larry and Gail Rhynard
Bibref 1294 - The Midwestern Native Garden: Native Alternatives to Nonnative Flowers and Plants An Illustrated Guide (2011) Adelman, Charlotte and Schwartz, Bernard L.
Search More Titles in Bibliography
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter
Additional resourcesUSDA: Find Silphium terebinthinaceum in USDA Plants
FNA: Find Silphium terebinthinaceum in the Flora of North America (if available)
Google: Search Google for Silphium terebinthinaceum
MetadataRecord Modified: 2023-01-16
Research By: TWC Staff