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Canada thistle

Canada Thistle

Cirsium arvense

Family Name:

Asteraceae

Class: C
Other Names:  
 Why is it a noxious weed? Once established, it spreads quickly replacing native plants. It grows in circular patches, spreading vegetatively through roots which can spread 10 -12' in one season. It poses an economic threat to the agriculture industry by reducing crop yields.

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Visit Washington State Noxious Weed Control Board Here