All photos by S. Donaldson.

Colorado State Parks. 2005. Colorado State Parks Weed Profile: Bull Thistle.

DiTomaso, J.M. and E.A. Healy. 2007. Weeds of California and Other Western States. University of California Publication 3488.

Forest Health Staff. 2005. Bull Thistle. USDA Forest Service, invasive

Whitson, Tom D. (editor). 2002. Weeds of the West. University of Wyoming, Jackson, Wyoming.

Donaldson, S. and Hanson Mazet, W. 2010, A Northern Nevada Homeowner’s Guide to Identifying and Managing Bull Thistle, Extension | University of Nevada, Reno, FS-10-19

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Also of Interest:

Identification and Management of Bull Thistle
This fact sheet contains information on Bull thistle by identifying the plant and understanding how to manage it by learning about the habitat, impact, and more.
Graham, J., Johnson. W., McAdoo, K. 2005, Extension | University of Nevada, Reno, FS-05-03

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