Noxious Weeds: The Cancer on Our Land

Noxious weeds pose a serious threat to all Idahoans and to the land we call home. Control and managing Idaho’s 67 noxious weed species requires an understanding of the problem, and that begins with detection and identification of noxious weeds.

Noxious weeds cost millions of dollars to Idaho by:

  • Fouling recreation sites from use
  • Chocking streams and waterways
  • Poisoning and injuring livestock and humans
  • Crowding out beneficial native plants
  • Degrading wildlife habitat
  • Creating wild fires in our forests and Idaho’s range land

The spread of noxious weeds in Idaho may signal the decline of entire ecological watersheds. They severely impact the beauty and create widespread economic losses. Noxious weeds are huge problems for our urban as well as rural areas, and for private, state, and federal lands. Valley County noxious weed species spare no segment of society – rancher, hunter, hiker’s and fisherman alike – and when unmanaged they spread rapidly and unceasingly and silently.


Notice To Control Noxious Weeds

It shall be the duty and responsibility of all landowners to control noxious weeds on their land
and property, in accordance with Title 22, Chapter 24 (22-2407).


Noxious weeds presently in Valley County include:

Eurasian Watermilfoil
Orange Hawkweed
Canada Thistle
Dalmatian Toadflax
Diffuse Knapweed
Field Bindweed
Poison Hemlock
Leafy Spurge
Oxeye Daisy
Hoary Alyssum
Rush Skeletonweed
Scotch Thistle
Spotted Knapweed
Tansy Ragwort
Purple Loosestrife
Yellow Toadflax


For help with identification, control methods, spray equipment to loan and information about our
CWMA cost-share program, contact Valley County Weed Control at 55 Gold Dust Road.

Valley County Weed Department Supervisor

Steve Anderson
Office  |  208-382-7199
Cell  |  208-382-7199

Idaho State Department of Agriculture

Jeremey Varley
Section Manager
Noxious Weeds
Nic Zurfluh
Section Manager
Invasive Species
Grasshopper/Mormon Cricket
South West Idaho
Fax (208)334-2283


Additional Noxious Weeds in Idaho

Booklets on 67 Idaho noxious weeds available at University of Idaho Extension Office.

Also see the State of Idaho Noxious Weeds Site.