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The Extension office provides assistance and programs for the community without discrimination in five main areas: 4-H Youth Programs, Agriculture, Community Health, Horticulture, and Small Acreage Management.

Weeds   arrow

Weeds are basically plants that are interfering with how we think our property should look. How a landowner manages their property can influence the number and type of weeds that they have. Over grazing pastures is one of the main reasons that weeds get a start on a property.  There are multiple methods landowners can use to manage their weeds, but the first step is to positively identify the weed.

In simple terms a weed is just a plant out of place, however, managing some of these weeds is not a simple task. Noxious weeds are invasive non-native plants whose control is mandated by law. These plants pose a serious threat to native habitats, impact recreation and agriculture. They have displaced 130 native Colorado plants on 553,163 acres* in Colorado (*Colorado Dept of Agriculture).

Canada Thistle

Weed ID Service

The first step in controlling weeds is knowing what weeds you are dealing with.

You may submit weed samples to our office for identification. Review “Guidelines” and fill out “ID Form”. Call 303-678-6238 with questions.


Biological Weed Management (Insects)

Organic Weed Management

Chemical Weed Management

Colorado Department of Agriculture Pesticides Program


(No endorsement implied)

Cultural Weed Management

– A Healthy Stand of Grasses is the Best Weed Suppression

Factsheets on Reseeding & Pasture Management


Local Sources for Weed Management

Mechanical Weed Management

Acetic Acid (“Vinegar”) Herbicides
Household, culinary vinegar is 5% acetic acid. While this concentration can provide some management, most commercial weed management products are 8-25% acetic acid. WHILE PERCEIVED AS LESS TOXIC HERBICIDES, THESE ACETIC ACID PRODUCTS HAVE HUMAN HEALTH HAZARDS THAT SHOULD BE TAKEN SERIOUSLY. WEAR APPROPRIATE PERSONAL PROTECTIVE EQUIPMENT (PPE) – EYE/FACE SHIELD, RESPIRATOR, CHEM GLOVES, CHEM APRON, ETC. Acetic acid concentrations over 11% can cause burns upon skin contact. Eye contact can result in severe burns and permanent corneal injury. The 25% acetic acid concentrations registered through EPA and the states for commercial use all have restricted entry intervals of 48 hours and list personal protection equipment to be used by the applicator.

Product Label Info

Colorado State University

Noxious Weeds & Invasive Species Management on Open Space