Considered a noxious weed in many parts of the country, Bull Thistle is often confused with Musk Thistle. The leaves of mature Musk Thistle lack the hairs found on the leaves of Bull Thistles.

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Bull Thistle is not native to North America and is believed to have been introduced to eastern North America in colonial times. The blooms create seed that attaches to a very downy seed head, and it's this down that is frequently used by the female American goldfinch when building her nest, often weaving it so skillfully and tightly that it will actually hold water. Bull Thistle easily roots in disturbed areas, including pastures, cleared forests, and fence edges, as well as in ditches and along roadways.

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