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Washington State Weeds

Russian Knapweed

Rhaponticum repens

Family Name:


Class: B
Other Names:

hardheads, Turkestan thistle

 Why is it a noxious weed?

It is an aggressive invader of pastures, non-crop areas, grain fields and other cultivated fields. In addition, the plant is poisonous to horses, causing chewing disease (equine nigropallidal encephalomalacia). Livestock may avoid this species.

More Information:




Visit Washington State Noxious Weed Control Board Here