Small Acreage Management:

Weeds Resources

How can I control weeds on my property?

1. Identify exactly what it is you want to get rid of. Use plant id guides or take a sample to your local CSU Extension office for identification.

2. Learn about the life cycle of your weeds in order to determine when the best time is to attack the plants.

3. Know that weeds can be controlled mechanically (mowing or shovel), chemically, or biologically. Find out what methods work best for the particular weeds on your property. It may be a combination of all three.

4. If you are unsure, call your local Weed District or CSU Extension for help.

Musk Thistle
Carduus nutans L.

Musk Thistle

What are noxious weeds?

Noxious weeds are non-native plants that disrupt native vegetation because they have no natural controls and are able to adapt to varied climate conditions. As a result of the Colorado Noxious Weed Act, Colorado noxious weeds have been placed on three separate lists: A, B, and C.

List A plants are designated to be eliminated everywhere in Colorado.

List B plants includes plants whose continued spread should be stopped.

List C plants includes plants in which control is recommended.

Noxious Weed Management Pocket Guide: - An easy to print and carry, Noxious Weed Pocket Guide gives you the information to identify and help manage some of the common weeds.


Biological Pest Control

More Info on Weeds

Weed Districts


Invaders Database System (University of Montana) searchable database of the noxious weed lists for all U.S. states and six southern provinces of Canada. The database can be searched by plant name, state name, or by clicking on a map.

NRCS Noxious and Invasive Weeds Federal and state noxious weed lists, an invasive plant list, or an introduced plant list, each with links to more information.

Western Weed Resources Catalog a collection of over 1000 books, brochures, articles, videos, and internet resources.

Federal Information and Programs:

Bureau of Land Management Weed Information

BLM Colorado Non-Native Invasive Plant Management Program

National Plant Board provides information on state and federally regulated plants. You can view individual state quarantine summaries on this site for state-specific noxious weed listings.

USDA Animal Plant Health Inspection Service plant pest information

USDA National Invasive Plant Species Information Center

US National Arboretum information on invasive plants

Research Programs:

Alien Plant Invaders of Natural Areas a web-based project of the Plant Conservation Alliance's Alien Plant Working Group, that provides information for the general public, land managers, researchers, and others on the serious threat and impacts of invasive alien (exotic, non-native) plants to the native flora, fauna, and natural ecosystems of the United States.

Center for Invasive Plant Management a regionally focused Center based at Montana State University. We work in partnership with county, state, and federal agencies, tribes, nongovernmental organizations, private industry, commodity groups, and academic institutions.

Cornell University Ecology and Management of Invasive Plants Program conducts research to assess the ecological impacts of introduced plant species.

High Plains Invasives Project a 3-year program targeting seven currently uncommon invasive weeds in Colorado’s Eastern High Plains.

National Jointed Goatgrass Research Program

Professional Organizations:

International Weed Science Society a worldwide scientific organization, whose goal is to supplement and complement their vital role. Additionally, IWSS provides benefits and functions of a weed science society not currently existing at a national or regional level.

Weed Science Society of America a non-profit professional society that promotes research, education, and extension outreach activities related to weeds; provides science-based information to the public and policy makers; and fosters awareness of weeds and their impacts on managed and natural ecosystems.

Western Society of Weed Science for weed science professionals working throughout the Western United States. Membership is open to anyone, including federal, state, and local employees, private company personnel, crop consultants, growers, or others interested in a wide variety of weed science related information.

Updated Wednesday, October 29, 2014