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Yellowstone County, Montana
Noxious Weed
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Scotch Thistle

Scotch thistle


Growth Habit: biennial that grows up to 12 feet.

Leaves: large, spiny, and covered with fine dense hair

Stem: broad, spiny wings

Flower: Flower heads are numerous, 1 to 2 inches in diameter, bracts spine-tipped. Flowers are Violet to reddish.




Habitat: Native of Europe and eastern Asia and is now sparsely naturalized over much of North America.

Biological Controls:

Herbicides: Milestone