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Wasowski, Sally and Andy
Silphium terebinthinaceum Jacq.
Prairie rosinweed, Prairie dock
USDA Symbol: SITE
USDA Native Status: L48 (N), CAN (N)
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. Prairie youngsters use the resin for chewing gum. It tastes like carrots and pine. (Lamb/Rhynard)
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug , Sep
, WV Canada: ON Native Distribution:
S. Ont. & OH
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.
Conditions Comments: Not Available
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)
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:
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Suppliers Directory
According to the inventory provided by Associate Suppliers, this plant is available at the following locations:
Ohio Prairie Nursery
- Hiram, OHPrairie Nursery
- Westfield, WI
Record Last Modified: 2012-12-09
Research By: TWC Staff