Cirsium arvense
Common name(s): Canada thistle Family: Asteraceae Genus: Cirsium
28 states listed

State Distribution (28 / 50 states)

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

Listings by State

State Classification Common Name Listed Notes
CaliforniaBCanada thistle
ColoradoClass CCanada thistle
ConnecticutRestrictedCanada thistle
DelawareNoxiousCanada thistle
GeorgiaRestrictedCanada thistle
IdahoClass BCanada thistleRestricted
IndianaTerrestrial InvasiveCanada thistlePerennial herb
IowaNoxiousCanada thistlePerennial thistle
KansasClass BCanada thistleRestricted
KentuckyNoxiousCanada thistlePerennial thistle
MaineProhibitedCanada thistleDo Not Sell List
MarylandProhibitedCanada thistleNoxious
MichiganProhibitedCanada ThistlePerennial forb
MontanaPriority 2BCanada ThistleWidespread
New JerseyNoxious WeedCanada ThistleProhibited seed
New MexicoClass BCanada ThistlePerennial forb
New YorkProhibitedCanada ThistlePerennial forb
North CarolinaClass BCanada ThistlePerennial forb
North DakotaProhibitedCanada ThistlePerennial forb
OhioProhibitedCanada ThistlePerennial forb
OklahomaNoxiousCanada ThistlePerennial forb
Rhode IslandInvasiveCanada ThistlePerennial forb
South DakotaClass 1Canada thistlePerennial
VirginiaTier 2Canada thistlePerennial
WashingtonClass BCanada thistlePerennial
West VirginiaNoxiousCanada thistlePerennial
WisconsinNoxiousCanada thistlePerennial
WyomingDesignatedCanada thistlePerennial
Data compiled from individual state Department of Agriculture noxious weed lists. Verify against current official state sources before regulatory use.  |  U.S. Noxious Weed Database — generated April 2026.