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Silphium pinnatifidum

tansy rosinweed add to wishlist

Plant types and subtypes: Perennials

Light Requirements: sun

Water Use: medium

Soil Moisture: moist, wet

Soil Description: rich, average, poor

Height: 3'-6'

Bloom Time: July, August, September

Bloom Color: yellow

Leaf Color: green

Hardiness Zone: 5, 6, 7

Additional Tags: attracts birds, attracts butterflies, clumping, colonizing, cottage garden plant, naturalizing, rare

Flower of Silphium perfoliatum var. connatum (cup plant)
  • Flower of Silphium perfoliatum var. connatum (cup plant)
  • Silphium pinnatifidum (tansy rosinweed)
  • Flower of Silphium perfoliatum var. connatum (cup plant)
  • Flower of Silphium perfoliatum var. connatum (cup plant)

Pricing & Availability

Description

Silphium pinnatifidum

Also known as:

tansy rosinweed

,

prairie dock

,

cup leaf prairie-dock

,

cup-leafed prairie-dock

,

southern prairie-dock

Scientific Synonyms:

Silphium chickamaugense, Silphium terebinthinaceum

Description

Silphium pinnatifidum is a tall plant. From a clump of large (up to 2' in length), oval, basal leaves, emerges a smooth leafless stalk that branches out at the top. These bear loose clusters of 3" wide yellow flowers resembling sunflowers.

Cultivation

Loving full sun, tansy rosinweed is easy to grow in average to poor soil. It can be used for naturalizing prairies, but is also a beautiful choice for cottage gardens or the back of perennial borders. It may bloom from July to September. Zones 4-8

Propagation

Propagate from fresh seeds in fall. Stored seeds should be cold stratified before spring planting.

Additional Notes

Silphium pinnatifidum is a rare species, vulnerable in its native range due to soil disturbance and recreational activities. It is shorter and less hairy than the compass plant (Silphium laciniatum) with which it is sometimes confused. The genus got the common name rosinweed, because of the large amounts of resin exuded from injured parts of the plant.

Native Range & Classification

Recorded County Distribution: USDA data

Native Range:
AL, GA, IL, IN, KY, TN, WI

USDA Endangered Status:

  • Special Concern: KY
  • Threatened: TN

Classification

Kingdom Plantae Plants
Subkingdom Tracheobionta Vascular plants
Superdivision Spermatophyta Seed plants
Division Magnoliophyta Flowering plants
Class Magnoliopsida Dicotyledons
Subclass Asteridae
Order Asterales
Family Asteraceae Aster family
Genus Silphium rosinweed
Species Silphium pinnatifidum tansy rosinweed