Whole-leaf Rosinweed
Silphium integrifolium

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Silphium (SIL-phee-um) (Info)
Species: integrifolium (in-teg-ree-FOH-lee-um) (Info)

Category:

Perennials

Height:

36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)

Spacing:

24-36 in. (60-90 cm)

Hardiness:

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Danger:

N/A

Bloom Color:

Bright Yellow

Bloom Time:

Late Spring/Early Summer

Mid Summer

Foliage:

Herbaceous

Other details:

This plant is attractive to bees, butterflies and/or birds

Average Water Needs; Water regularly; do not overwater

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Non-patented

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; stratify if sowing indoors

Seed Collecting:

Collect seedhead/pod when flowers fade; allow to dry

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Menifee, California

Denver, Colorado

Batavia, Illinois

Chicago, Illinois

Glen Ellyn, Illinois

Iowa City, Iowa

Appleton, Wisconsin

Westfield, Wisconsin

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Gardeners' Notes:

1
positive
0
neutrals
0
negatives
RatingContent
Positive

On Feb 7, 2014, Rickwebb from Downingtown, PA wrote:

It is a native forb of the Midwestern USA prairie that I see in prairie or American meadow restorations. It gets its name from having resinous juices. The flowers are good for pollinators and the nutritious seeds are loved by birds, like the other three similar Silphium of Cup-Plant, Compass-Plant, and Prairie Dock. Sold at native plant nurseries.