Species: Scotch thistle (Onopordum acanthium)

Growth Form: Perennial

Key Identifying Characteristics: Distinguished from other thistles by its large size; spiny wings attached to the stems; dense, fine hair gives it a characteristic grayish-blue or blue-green color. Rosettes often have huge, broad leaves.

Reproduction: Seed

Seed Longevity: 30 years

Native To: Eurasia

Effective Control Methods: Best controlled in the rosette stage (otherwise use an axe!) sever taproot 1-2 inches below the ground; mechanical combined with herbicide in spring or in fall to rosettes.

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