Toxicity | Toxic. Horses. |
Control | Mechanical and herbicide. Contact your County Weed District or local Applicator for more information. |
Habitat | Irrigation ditches, river corridors, forests, grasslands, roadsides, rangelands and pastures. |
Root | Extensive root system. |
Leaf Shape | Deeply lobed lower leaves, linear upper leaves. |
Lifespan | Perennial; two years or longer. |
Priority 2B Weed | Abundant in Montana and widespread in many counties. |
Similar Looking Plants | Spotted knapweed, meadow knapweed and diffuse knapweed. |
Important Information | Root system has a black, bark-like covering. Plant is allelopathic (inhibits growth of other plants) and develops dense stands due to its ability to out-compete resident vegetation. |