Photo by Gary Kurtz
Rosinweed is a native, perennial wildflower in Wisconsin. It typically grows between 3 to 6 feet tall and features bright yellow flowers that resemble sunflowers. The flower heads measure up to three inches in diameter. The leaves of rosinweed are quite distinctive. They are large, rough, and stalkless, growing in pairs along the stem. Each leaf can be up to 8 inches long and is lance-shaped to ovate. The plant is named for the sticky, resinous sap that oozes from cut or broken stems. It can be found in prairies, glades, and roadsides. Rosinweed thrives in a variety of soil conditions, from moderately dry to moist, and is well-suited to tough clay soils. It prefers full sunlight but can tolerate partial shade, and once established, it is drought tolerant. (July)