DCHP-1 Online
Canada thistle 
a thistle, Cirsium arvense, introduced into Canada from France.
See also: Canadian thistle
- 1829 The plant is so rank that . . . it has even been said that it will exterminate the Canada thistle.
- 1964 For some time, weed specialists have sought a chemical that would not only kill the tops of Canada thistle, but would destroy underground growth without sterilizing the soil.
- 1829 The plant is so rank that . . . it has even been said that it will exterminate the Canada thistle.