Canada Thistle

Canada Thistle
Cirsium arvense
Canada thistle is the most common thistle in New England. It is distinguished by having many small flowerheads.

Canada Thistle
Cirsium arvense (L.) Scop.
Other names: Creeping Thistle.
Family: Asteraceae, Aster or Composite
Genus: Cirsium ...

Canada Thistle
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Canada Thistle
Scientific name: Cirsium arvense (L.) Scop
Common names: Canada thistle, Californian thistle, Canadian thistle, creeping thistle, field thistle, corn thistle, perennial thistle, field thistle ...

Canada thistle is declared a "noxious weed" throughout the U.S. and has long been recognized as a major agricultural pest, costing tens of millions of dollars in direct crop losses annually and additional millions costs for control.

Canada Thistle spreads easily by both seed and root and it is, therefore, very difficult to exterminate. Cutting down this Thistle only brings up five times as many root sprouts as before.

Cirsium arvense. Canada Thistle. Canada thistle is an imported invasive weed from Eurasia, not from Canada. For more information go to Canada thistle ecology and control..

Canada Thistle [English]: Cirsium arvense
Canada Tick-Trefoil [English]: Desmodium canadense
Canada Tickclover [English]: Desmodium canadense
Canada Toadflax [English]: Nuttallanthus canadensis
Canada Toadflax [English]: Antirrhinum canadense ...

Canada Thistle - Cirsium arvense
Corn Thistle - Cirsium arvense
Corn Sow Thistle - Sonchus arvensis
Creeping Thistle - Cirsium arvense
Cursed Thistle - Cirsium arvense
Field Sow Thistle - Sonchus arvensis
Green Thistle - Cirsium arvense ...

boar thistle, bull thistle, California thistle, Californian thistle, Canada thistle, Canadian thistle, corn thistle, creeping thistle, perennial creeping thistle, cursed thistle, field thistle, green thistle, hard thistle, perennial thistle, ...

Nombres relacionados: Acker-Kratzdistel (alemán), Asteraceae (familia), Canada thistle (inglés), Cardo cundidor (castellano), Cardo oloroso (castellano), Cirsium oleraceum (similar), Yichliac rolny (eslovaco).
Floración: Verano ...

For really difficult perennial species like smooth brome (Bromus inermis) and Canada thistle (Cirsium arvense), however, it may be necessary to consider an herbicide like Roundup.

See also: Thistle, Aster, Sunflower, Rose, Grass