Noxious Weeds Profile -
- English - Canada thistle
- French - chardon des champs, chardon du Canada
- Latin - Cirsium arvense (L.) Scop.
- Ontario Weeds Act - noxious
- Other provinces - noxious in AB, BC, SK, MB, and QC
- Canadian Federal Seeds Act - Class 3
- U.S. Federal Noxious Weed - no
- U.S. Noxious State Reg - 42 states (incl. Illinois, Indiana,
Mich, Ohio, Penn, New York, Minn, Wisc,)
- Pub 505 - no
- NE Weeds - no
- Canadian Poison Plant - not listed
- Cornell Poison Plant - not listed
- Common in pastures, roadsides and waste areas.
Method of Propagation
- Seeds, Wind blown, Roots/rhizome
- Can be controlled by dicamba and glyphosate products. Spray
at early bud stage or in early fall. Repeated applications are
needed to kill all root buds. 2,4-D gives top growth control only.
Light to medium infestations can be controlled with repeated mowing
at 21 day intervals.
- Similar to Japanese barberry which does not normally host the
rust fungus. Hybids of these two species may host the fungus.
Populations are relatively stable and much lower than for European
buckthorn. Rust does not occur every year but can cause significant
impact in some years.
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