The spread of thistles is a problem facing many landowners in Oklahoma. The Oklahoma Noxious Weed Law declares musk, Scotch, and Canada thistles to be noxious weeds and a public nuisance. All landowners whose land is infested with these thistles are required to control the thistles on their property. Failure to do so can result in a fine being assessed.

There are no funds available to assist landowners with the cost associated with the control of these thistles. However, landowners are encouraged to contact Oklahoma State University Extension for recommendations on a plan of action.

Individuals wishing to report thistle infestations that are not being controlled can file a complaint with the Department of Agriculture, Food and Forestry. The Department will send an inspector to determine if the thistles are either native or one of the listed noxious weeds. The landowner will then be notified and informed about their responsibility.

• Musk Thistle
• Scotch Thistle
• Canada thistle

Controlling Musk Thistle