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Illinois Native Plant Guide - Prairie Dock - Pages 140-141

Illinois Native Plant Guide

Prairie Dock
Silphium terebinthinaceum

Preferred Water Depth and Inundation Tolerance

Wet prairie or sedge meadow species. Species tolerates 0-6 inches of inundation for short durations early in the season.

Wildlife Value

Palatable to grazing species. Attracts butterflies and other insects.

Application/Zone

Used for upland slope buffer stabilization.

Availability, Establishment, and Maintenance

  • Easily propagated from seed.
  • To produce bare root transplants, sow seed 1/2 inch deep in late summer. Late planting is necessary because of rapid growth of taproot and will produce transplant stock in the fall or early the following spring.
  • On permanent sites, use transplants in the fall or early spring, or sow unstratified seed in the fall or stratified seed in the spring.
  • Requires light for germination.

Prairie Dock
Silphium terebinthinaceum

Mature Height
Up to 10 feetPrairie Dock

Plant Type
Perennial herb

Indicator Status
Facultative (-)

pH
4.5-7.5

Nutrient Load Tolerance
Low to moderate

Salt Tolerance
Low

Siltation Tolerance
Low to moderate

Flowering Color and Time
Yellow
July to September

Light Preference
Full sun

Seeding Rate
.03 - .19 lbs/acre

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