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Invasive & Noxious Weeds (Invasive Species)

Weeds Affect Millions of Acres of Public Lands

Field of spotteed knapweed. Montana. Norman E. Rees, USDA Agricultural Research Service,

Field of spotted knapweed.  Photo by Steve Dewey, Utah State University

The Bureau of Land Management (BLM), an agency of the U.S. Department of the Interior, manages close to 250 million acres of public lands primarily in the Western United States, including Alaska. 

One of the BLM's highest priorities is to promote ecosystem health and one of the greatest obstacles to achieving this goal is the rapid expansion of weeds across public lands. These invasive plants can dominate and often cause permanent damage to natural plant communities. If not eradicated or controlled, noxious weeds will continue to jeopardize the health of the public lands and to constrain the myriad activities that occur on public lands.

The BLM works with State, Federal and local parters to reduce the spread of invasive species, with an emphasis on early detection of and rapid response to new invasions in order to reduce the need for larger, more expensive treatments later on. 

Follow the links below to learn more about the BLM's invasive species program.

Pulling Together: National Strategy of Invasive Plant Management

What are Noxious and Invasive Weeds?

Why are Invasive Species a Problem?

Scale of Weed Invasions on Public Lands

Invasive Animals and Diseases Also Affect Public Lands

The BLM’s Weed Management and Invasive Species Program

What You Can Do

Case Studies

For More Information

Scotch Thistle



Other Weed Related Pages

FICMNEW honors Dr. John Lydon. Click here for story. 

 Dr. John Lydon

Dr. John Lydon

 Dalmatian Toadflax. Bob Nowierski, Montana State University,

Dalmatian Toadflax

Volunteer digging Scotch Thistle, Millard, Utah.  Steve Dewey, Utah State University.

Volunteer at Scotch Thistle Day

(left) Scotch Thistle