Noxious Weed Control Program

Musk thistle flower Noxious weeds are one of the greatest threats to the 
Kansas  environment.  They displace native plant species, interfere with the production of agricultural crops, increase erosion, destroy wildlife habitat and decrease property values.

The Kansas Department of Agriculture is responsible for the administration of the state Noxious Weed Law.  The State Weed Specialist works to aid in the control and management of noxious and invasive weeds in Kansas.  The Noxious Weed Control Program provides technical assistance to individual landowners, state and federal agencies as well as other companies and organizations that manage land in our great state.


Kansas Noxious Weeds

There are 12 plant species designated as noxious weeds in Kansas. Two other species are designated as county option weeds. Check with your County Weed Department to find out if one or both have been designated as noxious in your county.

2015 Survey Data
  • Bur Ragweed (Bursage) (Ambrosia grayii)

  • Canada Thistle (Cirsium arvense)

  • Field Bindweed (Convolvulus arvensis)

  • Hoary Cress (Cardaria draba)

  • Johnsongrass (Sorghum halepence)

  • Kudzu (Pueraria lobata)

  • Leafy Spurge (Euphorbia esula)

  • Musk Thistle (Carduus nutans)

  • Pignut (Hoffmannseggia densiflora)

  • Quackgrass (Agropyron repens)

  • Russian Knapweed (Centaurea repens)

  • Sericea Lespedeza (Lespedeza cuneata)

County Option Weeds

  • Bull Thistle (Cirsium vulgare)

  • Multiflora Rose (Rosa multiflora)

Kansas Noxious Weed Law

The first Kansas Noxious Weed Law was enacted in 1937.  Close up of 2 bindweed flowersSince then it has been adapted as times have changed.  It  requires every person, company, organization or agency to
control, and eradicate those species declared by the legislature to be noxious.
Link to full text of the
The Kansas Noxious Weed Law


Responsibilities Under The Weed Law

  • Board of Commissioners

  • County

  • Landowner

  • State

  • Weed Director

County Weed Directors

Each county has a designated Weed Director who is responsible for working with landowners to help them in controlling and eradicating the noxious weeds on their land.  They also manage the weeds on county property.

County Weed Director's Association of Kansas

Invasive Weeds

There are many weed species that have the potential to cause damage to the environment but are not have not been declare noxious in Kansas.  These are invasive weeds.  We are just as concerned about these weeds as we are with noxious weeds. 

Integrated Weed Management

Integrated weed management circles and how each work together
In managing noxious weeds one must take into account more than just how to eliminate them as quickly or as cheaply as possible.  Care must be taken to consider the soil, water and desirable plants as well as the adjoining properties.  Plans should be developed to implement as many Integrated Weed Management techniques as are appropriate for your site and both the plants you would like to eliminate and those you would like to protect.

Biological Control

  • Determining which insects can be used for biological control

  • Grazing – An alternative form of biological control

  • Biological agents are not available for all noxious weeds in Kansas

  • Permits and Regulations

Chemical Control

  • Licensed Pest Control Companies

  • Cost Share Herbicides

Cultural Control

  • Managing Your Land to Prevent Noxious Weeds

  • Controlling the Noxious Weeds You Already Have

  • Early Detection and Rapid Response

  • Restoration of Treated Areas

Mechanical Control

  • Not All Weeds Should be Controlled with Mechanical Means

  • Mechanical Options for Specific Noxious Weeds

Cost Share Herbicides

Along with a Weed Director, each county has some herbicides available to landowners, at a discounted price, for the control of noxious weeds.  If you are fighting one or more noxious weeds, contact your Weed Director for information on which herbicides are available for use on the noxious weeds on your land.

While herbicides are more easily identified by their brand names, many chemicals are sold under several brand names which are produced by a variety of companies.  So, to save room and to avoid the perception of our promoting one brand or company over another, we have listed the cost share herbicides by their chemical names.  Contact your County Weed Director for assistance in selecting the best herbicide for your situation.

Report a Weed

While the Department and the County Weed Directors are always on the lookout for new populations of noxious and invasive weeds, we cannot find everything that is out there.  We need your help.  If you find a plant you know to be noxious or invasive or you are just concerned that it might be, please report it by following the link below and filling out the information requested.

You can also download a smartphone app for either I-phone or Android that will allow you to report a weed sighting on the go.  Just search “Eddmaps” and select the “EDDMapS West” app.  There is more information at the link above or you can call the Kansas Department of Agriculture for assistance.


Weed Links