Species: Bull thistle (Cirsium vulgare)

Growth Form: Biennial

Key Identifying Characteristics: Deep green foliage, flowers usually deep purple, only thistle in Colorado with spines on the upper surfaces of the leaves.

Reproduction: Seed

Seed Longevity: 1-5 years

Native To: Eurasia

Effective Control Methods: Anything that will prevent seed production. Mechanical, cultural, herbicide, grazing.

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