Photo Courtesy of "Weeds of the West"

Species: Canada thistle (Cirsium arvense)

Growth Form: Deep-rooted, creeping perennial

Key Identifying Characteristics: Flowers usually purple (sometimes white) and fragrant, foliage deep green; bracts around flower are spineless.

Reproduction: Primarily vegetative, seed viability low

Seed Longevity: Approximately 3 years

Native To: Eurasia

Effective Control Methods: Mechanical control (mowing or cutting) during growing season followed by herbicide application inthe fall is very effective. Grazing can be effective and can be used in place of the mechanical control.

 

 

 

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