Russian Knapweed – Invasive Weed

“Invasive Weeds” are non-native plants that crowd our native and desirable species important to Warm Springs People and Wildlife.

Russian Knapweed grows in pastures, hayfields, irrigation ditches and roadsides.  It is known to be poisonous to horses.  The plant is a bushy perennial, reaching 1-3 feet tall with pink or purple flower heads.  It reproduces by seed and spreads by its root system.  Control with a herbicide at bud stage or fall regrowth.  Planting competitive vegetation reduces rate of spread.

To learn more about controlling invasive weeds like Russian Knapweed – you can contact these local resources:  Suzie Miller at the Warm Springs Branch of Natural Resources (541-553-2007, [email protected]), Terry Stradley at the Warm Springs Branch of Natural Resources (541-553-2009, [email protected]), Todd Shockney at the Jefferson County Noxious Weed Department (541-475-4459 ext. 5325), Scott Duggan, Oregon State University Warm Springs Extension (541-553-3238,  [email protected])