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The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.
Diffuse KnapweedCentaurea diffusa
Photo from Weeds of the West, revised edition
Photos from Montana Weed Control Association
Video Supplied By Montana Weed Control Association
| Attribute | Description |
|---|---|
| Growth Habit | Diffusely branched annual or short-lived perennial, 1 to 2 feet tall. |
| Leaves | Leaves are pinnately divided. |
| Stem | Stems are rough to the touch, 1 to 2 feet tall. |
| Flower | Flowers are white to rose or sometimes purplish; margins of involucral bracts are divided like the teeth of a comb, and bracts are tipped with a definite slender spine. Achenes are brown or grayish; pappus is lacking. |
| Roots | Elongated taproot. |
| Seeds | Oblong, dark brown or grey with longitudinal lines. |
| Reproduction | By seed. |
| Habitat | Diffuse Knapweed can be found in pastures, rangeland, roadsides, waste areas, as a highly competitive plant. |
| Biological Controls | — |
| Herbicides | Tordon; Tordon + 2,4-D; Curtail + 2,4-D; dicamba + 2,4-D; Milestone. |