description Rosinweed Overview
Rosinweed, Silphium integrifolium, is a tall perennial wildflower native to prairies and open grasslands of central North America. It bears yellow, composite flower heads resembling small sunflowers on sturdy stems during summer and early autumn. The common name refers to the sticky, resinous material produced by damaged stems, and its deep-rooted growth helps it persist in prairie conditions.
help Rosinweed FAQ
What is the scientific name for rosinweed?
The plant commonly called rosinweed is Silphium integrifolium, also known as whole-leaf or entire-leaf rosinweed. It is a native perennial associated with prairie and open-grassland habitats. [North Carolina Extension](https://plants.ces.ncsu.edu/plants/silphium-integrifolium/)
How tall does Silphium integrifolium grow?
It commonly reaches about 2 to 3 feet, although individual plants can grow as tall as 6 feet. Its yellow composite flower heads appear during the summer flowering season. [North Carolina Extension](https://plants.ces.ncsu.edu/plants/silphium-integrifolium/)
Why is it called rosinweed?
The common name refers to the sticky, resin-like substance found on parts of the plant. Its yellow flowers can also make it look somewhat like a small sunflower, although it belongs to the genus Silphium. [USDA](https://www.nrcs.usda.gov/plantmaterials/nmpmctn12632.pdf)
Where does rosinweed grow naturally?
Silphium integrifolium is a prairie plant of central North America that prefers open, sunny conditions. Its yellow flowers provide a useful late-season nectar source for insects in restored and remnant grasslands. [North Carolina Extension](https://plants.ces.ncsu.edu/plants/silphium-integrifolium/)
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