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Canada Thistle

(Cirsium arvense L.)

Asteraceae (Sunflower Family)


small flowering Canada thistle

young shoots from creeping roots ▲▼

▲▼ flowering plants are relatively short, and have thin, upright, slightly branched stems and small inflorescences (usually 1" diameter or smaller)

▲▼ large 30+ foot diameter clonal colony of Canada thistle in Minnesota

inlforescence in bud and flowering

▲▼ inflorescences after flowering and beginning to release seed

▲▼ fruit of Canada thistle

creeping root system of Canada thistle

Canada thistle:  

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