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Canada Thistle
AppearanceCanada Thistle Plant
Canada thistle is a perennial forb that reproduces by seeds and rhizomes which send up new shoots every 8 to 12 inches. Canada thistle is not just another pretty flower. Severe infestations can reduce wheat yields up to 65% and corn yields by 35%. Canada thistle reduces the carrying capacity of a pasture because cattle avoid the prickly, thistle infested areas.

Found in north central parts of Kansas, Canada thistle is spreading. To avoid infestations in Pratt County, plant weed free seed, use weed free livestock feed, and be sure equipment is cleaned before leaving infested fields. Attention should be paid to any feed or seed imported from northern or northwestern states.

Cultivating a Canada thistle patch will break up the root system and quickly compound the problem unless you intensively cultivate for a whole season.

Control
There are no biological controls approved for use in Canada thistle at this time. Numerous herbicides are available to control and eradicate Canada thistle.

Treatment
Recommended herbicides are available at the Pratt County Noxious Weed Department on a cost-share basis.

For more information regarding this noxious weed you can either contact our office, or the County Weed Directors Association of Kansas, or go to the Kansas Department of Agriculture Noxious Weed Control Website.

Contact Us
Robert Torres
Director

Noxious Weed Department
Email

449 S.E. 20th St.
Pratt, KS 67124
View Map

Ph: 620-672-4127
Ph: 620-770-1208
Fx: 620-672-4128

Hours
Monday - Friday
7 a.m. - 3:30 p.m.

Pratt County, Kansas
Pratt County
300 S. Ninnescah
Pratt, KS 67124