Boise County Noxious Weed Department Office

2024 Boise County Noxious Weeds Spray Days.  Boise County will offer assistance to county residents for the treatment of noxious weeds.

Horseshoe Bend area:  for White Top and Scotch Thistle, call for information.  
Garden Valley area:  for Spotted Knapweed, Oxeye Daisy, Hoary Alyssum and Canada Thistle – April 26 and 27 at the Boise County Road Shop on the Banks/Lowman road from 9:00am to 4:00pm.
Idaho City and Centerville areas:  for Spotted Knapweed – May 10 and 11 at the Boise County Road Shop on Buena Vista Road from 9:00am to 4:00pm.

Pre-mixed herbicide and safety equipment will be available.  A limited amount of County owned back pack sprayers will be available for use.  Boise County Noxious Weed Department Office hours are Monday thru Thursday, 8am to 3:30pm, 208-793-2447.

2024 Pesticide Disposal Dates sponsored by the Idaho Department of Agriculture.  Canyon County/Pickles Butte Landfill will offer pesticide disposal on April 25th.  Located at 15500 Missouri Ave, Nampa, ID.  From 9:00am to 1:00pm.  For more information and other locations and dates please click on the below flyer.
ISDA 2024 Pesticide Disposal Flyer

Spotted Knapweed is one of the most prevalent noxious weeds in Boise County

Idaho Code Title 22 Chapter 24 (22-2407) States:

  1. It shall be the duty and responsibility of all landowners to control noxious weeds on their land and property, in accordance with this chapter and with rules promulgated by the director.
  2. The cost of controlling noxious weeds shall be the obligation of the landowner.
  3. Noxious weed control must be for prevention, eradication, rehabilitation, control or containment efforts. However, areas may be modified from the eradication requirement if the
    landowner is a participant in a county-approved weed management plan or county-approved cooperative weed management area.
  4. The landowner shall reimburse the county control authority for work done because of failure to comply with a five (5) day notice, as outlined in section 22-2405, Idaho Code.
  5. If an article is infested with noxious weeds, it shall not be moved from designated premises until it is treated in accordance with the applicable rules, or in accordance with the written permission of a control authority.

Control of Noxious Weeds is the Landowner’s Responsibility


Idaho has 73 different species of weeds, which are designated noxious by state law.

  • Black Henbane
  • Bohemian Knotweed
  • Brazillian Elodea+
  • Brooms (Scotch, French, Spanish)
  • Buffalobur
  • Canada Thistle*#
  • Common Crupina
  • Common Reed Phragmites
  • Common/European Frogbit+
  • Curlyleaf Pondweed#
  • Dalmatian Toadflax*#
  • Diffuse Kanpweed*#
  • Dyer’s Woad
  • Eurasian Watermilfoil*
  • Fanwort+
  • Feathered Mosquito Fern+
  • Field Bindweed*#
  • Flowering Rush#
  • Giant Hogweed+
  • Giant Knotweed
  • Giant Salvinia+
  • Goatsrue +
  • Hoary Alyssum#*
  • Hoary Cress (White Top)*#
  • Houndstongue*#
  • Hydrilla+
  • Iberian Starthistle+
  • Japanese Knotweed
  • Johnsongrass
  • Jointed Goatgrass*#
  • Leafy Spurge*#
  • Matgrass
  • Meadow Knapweed*
  • Mediterranean Sage*
  • Milium#
  • Musk Thistle*
  • Orange Hawkweed*
  • Oxeye Daisy*#
  • Parrotfeather Milfoil
  • Perennial Pepperweed#
  • Perennial Sowthistle
  • Plumeless Thistle#
  • Policeman’s Helmet+
  • Poison Hemlock*#
  • Puncturvine*#
  • Purple Loosestrife*#
  • Purple Starthistle+
  • Rush Skeletonweed *#
  • Russian Knapweed
  • Saltcedar#
  • Scotch Thistle*#
  • Small Bugloss
  • Spotted Knapweed*#
  • Squarrose Knapweed+
  • Starry Stonewort+
  • Syrian Beancaper+
  • Tall Hawkweed+
  • Tansy Ragwort#
  • Turkish Thistle+
  • Variable-Leaf-Milfoil+
  • Vipers Bugloss
  • Water Chestnut+
  • Water Hyacinth+
  • White Bryony#
  • Yellow Devil Hawkweed+
  • Yellow Flag Iris#
  • Yellow Floating Heart+
  • Yellow Hawkweed
  • Yellow Starthistle*#
  • Yellow Toadflax *#

+ Denotes Statewide Early Detection/Rapid Response Noxious Weed List.
Weeds identified within Idaho shall be eradicated during the same growing season as identified.

# Denotes Statewide Containment Noxious Weed List. Weeds listed in the containment noxious weeds list are known to exist in various populations throughout the state. Weed control efforts may be directed at reducing or eliminating new or expanding weed populations while know and established weed populations, as determined by the weed control authority, may be managed by any approved weed control methodology, as determined by the seed control authority.

*Denotes Noxious Weeds found in Boise County

Prohibited Genra.  Plants in this category are prohibited from the state and may not be sold or moved within the state.
Brooms:  Tagaste, Escabon or Tree Lucerne, Scotch Broom, French Broom or Spanish Broom.

Visit the below links for more information on Noxious Weeds and West Nile:

Idaho Noxious Weed Law

Invasive Species of Idaho.

West Nile Information.  

Office Contact Information

Department Head
Paul Rekow
[email protected]

PO Box 309
Horseshoe Bend, Idaho 83629
Ph: 208-793-2447
Fax: 208-793-2501
Administrative Assistant
Kari Allred
[email protected]

Office Hours:

Mon – Thur 6am to 4:30pm

Personnel may be in the field, call to insure that someone will be in the office.