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Noxious weeds are non-native plants that were brought into Idaho through human actions. Because they grow aggressively and have no natural enemies in our area, these species of plants can be destructive to wildlife habitat, competitive with crops and difficult to control. Legally, a noxious weed is any plant designated by a Federal, State or county government as injurious to public health, agriculture, recreation, wildlife or property. Some characteristics of noxious weeds include:
Learn more on our Weeds page.
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Yes. You may access the Idaho statute at the Idaho Legislature website.
Idaho State law states that it is the responsibility of the land owner to control the noxious weeds on their property. Contact Noxious Weed Control at 208-446-1290 for more information.
The land owner(s) or homeowner's association is responsible for controlling the noxious weeds in these areas. For more questions, contact Noxious Weed Control at 208-446-1290.
Most of these weeds came from Europe and Asia and were transported to the United States with the colonists who brought many plants and seeds species when they came to the United States. Accidental transport occurred in the ballast of ships, in the fleece and hair of livestock, in clothing, and as contaminants in agricultural seed. Other weeds came in as medicine, dyes and ornamental plants. A portion of the noxious weeds were intentionally introduced for use in agriculture, landscaping, erosion control and for sale in the nursery trade. Contact Noxious Weed Control at 208-446-1290 for more information.
Is your property being maintained? If so, spotted knapweed will not take hold in a property that is being watered, fertilized and mowed. Do you live within the city limits? Most cities have ordinances for vegetation height that are stricter than the state weed law. Contact the Code Enforcement Officer in your city. Do you live in a subdivision/neighborhood with covenants? Many homeowner associations have stricter rules than the state weed law and can have properties maintained within a subdivision at a cost to the owner.
Homeowner associations can notify property owners (both local and "absentee") about weed control and some will have the maintenance done and then send them a bill. Most people will voluntarily take appropriate action once they become aware of the problem. If there is a property within Kootenai County that is infested and the owner is not controlling noxious weeds then the County weed control can respond to official complaints. Contact the Noxious Weed Control department for more information.
When spotted knapweed gets high and dry, it looks bad. Spraying doesn't solve the problem because it's usually too high and too hot to spray. We will gladly do an inspection and inform your neighbor that according to Idaho State Law it is the responsibility of the homeowner to control noxious weeds on their property. This office supports mowing as a control and containment method (which is supported in the State law), but we cannot make people spray their weeds (landowner rights). Also, mowing needs to be done when it's safe, once the weather has cooled and/or rain has relieved the dry conditions.
Learn more on our Managing Your Land or Noxious Weeds pages.
It is common to use adjuvant/surfactants mixed with herbicides. These products, sometimes call spreader-stickers, increase the success of the treatment. They do this by improved penetration, increasing coverage, and extra absorption on the plants being sprayed. Some common brand names are R-11, R-900 and Sylgard 309.
If there are any questions about the use of a chemical product, please call your local weed control agency for instructions.
Herbicides are powerful tools, so they must be used according to label directions. Unfortunately, herbicides are used too often as the only control method. Herbicides can be one component of a good management plan. You can find more information from our Publications. Other methods include:
Yes. Please call our office or submit the Investigation Request from this website. We will be happy to set up a site visit with you. We will discuss the different weeds you have and how to control them.
No, the county does not sell herbicide, nor does it give herbicide to private landowners. Peruse our Resources list for local helpful resources.
Letting noxious weeds take over your property does not leave your land natural. Noxious weeds will eventually replace all native vegetation if the land is not managed correctly. Learn more on our Managing Your Land page.
Idaho State Department of Agriculture defines Early Detection and Rapid Response (EDRR) as finding invasive plant species during the initial stages of colonization and then responding within the same season to initiate eradication of the invasive plant species. Please see the list of EDRR weeds on the Weeds page. If you see any of the weeds on that list, please report it as soon as possible to the Kootenai County Noxious Weeds Control Office so we can positively identify it, map its location, and assist you in eradicating it.