Wholeleaf Rosinweed - Silphium integrefolium

 Category: Perennial

Common Name: Wholeleaf Rosinweed

Scientific Name: Silphium integrifolium

Sun Conditions:Full sun (tolerates some shade)

Soil Conditions: Average, medium, well-drained; very drought tolerant

Height Range: 2-3 ft (to 6 ft)

Width Range: 2-3 ft

Growth Habit: Upright, sturdy, rarely flops

Growth Rate: Medium

Bloom Color: Yellow

Bloom Time: Mid-summer (July-September)

Seed/Fruit Production: Cypsela (achene-like) seeds; goldfinches especially favor the seed

Foliage Color: Medium green, variable lance-to-ovate leaves, stalkless, opposite

Hardiness Zones: 4 to 8

Evergreen: No

Deer Resistant: Moderate — reports conflict

Forage: Foliage eaten by white-tailed deer and cattle in some areas; seeds favored by goldfinches; sticky resin was once used as chewing gum

Poisonous: No known significant toxicity; produces aromatic resin ("rosin")

Wildlife Value Highlights: Prairie/pollinator garden restoration, naturalized borders

Ecological/Landscape Use: Attracts bees, butterflies, and occasional hummingbirds; goldfinches favor the seed

Lepidoptera Supported by Family/Group: Host plant for the silphium (giant eucosma) moth and about 6 butterfly/moth species; Silphium species also support specialist bees

Lepidoptera Supported by Species: Eucosma giganteana

For More Info: https://plantfinder.mobot.org/PlantFinderDetails.aspx?taxonid=277469