Silphium radula var. gracile (Simpson Rosinweed)
Also known as Slender Rosinweed. Synonym: Silphium simpsonii var. wrightii.
Simpson Rosinweed is a big perennial with cheery yellow flowers that bloom from midsummer to early fall. It is best planted in groups and works well as a background accent, in prairies, native plants gardens, naturalized areas, and open woodland gardens.
AT A GLANCE
|Water use||Low, medium|
|Sun exposure||Full to part sun|
|Bloom time||Summer, fall|
|Mature height||2-6 ft
|Notes||Native bee friendly. Spreads by rhizomes.|
|Present in state|
|Present in county and native|
|Native to North America, but adventive & escaped in state|
|Not present in state|
|Present and rare, native in county|
|Previously present, now extinct|
|Questionable presence (cross-hatched, regardless of color)|