Idaho Noxious Weeds

Control and managing noxious weeds in the State of Idaho requires and understanding of the problem, and that begins with detection and identification of noxious weeds.


Weeds cost millions of dollars to our State by:
  • Degrading wildlife habitat
  • Choking steams and waterways
  • Crowding out beneficial native plants
  • Creating fire hazards in our forests and on our ranges
  • Poisoning and injuring livestock and humans
  • Fouling recreation sites from use


The spread of noxious weeds may signal the decline of entire ecological watersheds. They severely impact the beauty and widespread economic losses. Weeds are problems for urban as well as rural areas, and for private, state, and federal lands. Noxious weed species spare no segment of society-rancher, fisher, and biker alike and when unmanaged they spread rapidly, unceasingly, and silently. Noxious weeds pose a serious threat to all Idahoans and to the land we call home.

Idaho Noxious Weeds Not in Minidoka County

  • Bohemian Knotweed
  • Brazilian Elodea
  • Buffalo Bur
  • Common Crupina
  • Common Reed
  • Common/European Frogbit
  • Curlyleaf Pondweed
  • Dalmatian Toadflax
  • Eurasian Watermilfoil
  • Fanwort
  • Feathered Mosquito Fern
  • Flowering Rush
  • Flowering Rush
  • Giant Hogweed
  • Giant Knotweed
  • Giant Salvinia
  • Hoary Alyssum
  • Hydrilla
  • Hydrilla
  • Japanese Knotweed
  • Johnsongrass
  • Jointed Goatgrass
  • Matgrass

  • Meadow Knapweed
  • Mediterranean Sage
  • Milium
  • Orange Hawkweed
  • Oxeye Daisy
  • Parrot Feather Milfoil
  • Plumeless Thistle
  • Policeman's Helmet
  • Scotch Broom
  • Small Bugloss
  • Squarrose Knapweed
  • Tall Hawkweed
  • Tansy Ragwort
  • Variable-Leaf-Milfoil
  • Vipers Bugloss
  • Water Chestnut
  • Water Hyacinth
  • Yellow Devil Hawkweed
  • Yellow Flag Iris
  • Yellow Floating Heart
  • Yellow Hawkweed
  • Yellow Starthistle
  • Yellow Toadflax