Canada thistle
Cirsium arvense |
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| Family Name: |
Asteraceae |
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| Class: | C | |
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| 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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More Information:
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Visit Washington State Noxious Weed Control Board Here
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