Silphium terebinthinaceum

prairie rosinweed add to wishlist

Plant types and subtypes: Perennials

Light Requirements: sun

Water Use: low

Soil Moisture: dry, moist, wet

Soil Description: rich, average, poor, loam, clay, sand, gravel/rock

Height: 4'-10'

Bloom Time: July, August, September

Bloom Color: yellow

Leaf Color: green

Hardiness Zone: 4, 5, 6, 7, 8

Additional Tags: attracts bees, attracts birds, attracts hummingbirds, drought tolerant, naturalizing, ornamental foliage

Silphium terebinthinaceum

Pricing & Availability

Description

Silphium terebinthinaceum

Also known as:

prairie rosinweed

,

prairie dock

Scientific Synonyms:

Description

Silphium terebinthinaceum is a species with stunning proportions. The serrated basal leaves are up to 18" long and 12" across, forming vase-like rosettes up to 4' across. The flowering stems, although slender and bare, are very robust and can rise to a towering height of 10'. These stalks are generally green, but can also be tinted with reddish hues. They are terminally branched and bear daisy-like flowers that are 3" in diameter, with yellow rays and disks.

Cultivation

Prairie rosinweed is somewhat slow to establish, but is long-lived and trouble-free thereafter. It prefers a moist to dry location in full sun with soil rich in organic matter, but is tolerant of poor soil and seasonally wet conditions. The root system consists of a stout taproot which allows the plant to weather periods of drought with grace. It will occasionally produce vegetative offshoots, but is overall well behaved and will not spread aggressively. It has a long blooming period of a month or more, ranging from mid-summer to early fall. It can be grown as a specimen in the front of a perennial flower bed to showcase its impressive basal foliage, or planted in the back where its height can be used to full advantage. As indicated by its common name, this species is adapted to prairie environments and works well naturalized among grasses. Zones 4-8

Propagation

Propagate by sowing freshly collected seeds in the fall, or in the spring after a period of cold-moist stratification. If propagating in containers, deep pots should be used to accommodate the taproot.

Additional Notes

The genus common name rosinweed is a reference to the resinous sap typical to all silphiums.

Native Range & Classification

Recorded County Distribution: USDA data

Native Range:
AL, AR, DC, GA, IA, IL, IN, KY, MI, MO, MS, NC, OH, SC, TN, VA, WI, WV

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 terebinthinaceum prairie rosinweed