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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.
Yellow Flag IrisIris pseudacorus
Photo from Weeds of the West, revised edition.
Photos from Montana Weed Control Association
Video Supplied By Montana Weed Control Association
| Attribute | Description |
|---|---|
| Toxicity | Toxic. Livestock, dogs, cats and humans. |
| Growth Habit | Herbaceous perennial found in wet areas in water up to 10 inches deep. Plants are 3 to 4 feet tall with long, linear, dark green leaves. |
| Leaves | Long, linear, dark green leaves; emerge from the ground in a fan-like arrangement, similar to a common garden iris. Leaves have a raised midrib and are erect with the upper part arching. |
| Stem | Stems consist of flower stalks. |
| Flower | Several flowers are borne on erect flower stalks. |
| Roots | Rhizomes. |
| Seeds | — |
| Reproduction | Can spread by rhizomes and seeds. |
| Habitat | Wetlands and riparian areas. |
| Biological Controls | — |
| Herbicides | Glyphosate. |