Identifying Noxious Weeds

Noxious weeds are plants that the Kansas Legislature has declared to have a negative impact on agriculture, public health, the environment or the economy. The plants declared noxious by the State of Kansas are shown below. For specific questions, please contact the Noxious Weed Director at 913-715-8358.

Bur ragweed

bur ragweed

Seedlings: Utah—Idaho Cooperative Weed Management Area
Flower: ©2003 Geir Friisoe, Weeds of the Great Plains
Mature plant: © 2003 Geir Friisoe, Weeds of the Great Plains
Burs (seed): Utah-Idaho Cooperative Weed Management Area

Bur ragweed identification guide

Canada thistle

Canada Thistle

Seedling: Mark Shepard, Weeds of Oregon
Leaf, stem: ©2003-2011 John Hilty
Rosette: © 2006 Kansas Department of Agriculture
Flowers: LaPlata County Colorado
Mature plant: Dan Tenaglia, Missouriplants.com, Bugwood.org

Canada thistle identification guide

Field bindweed

Field bindweed

Seedling: Ken Chamberlain, The Ohio State University, Bugwood.org
White flowers: Steve Dewey, Utah State University, Bugwood.org
Leaf: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Pink flowers: Jan Samnek, State Phytosanitary Administration, Bugwood.org
Mature plant: Kootenai County Idaho

Field bindweed identification guide

Hoary cress

Hoary cress

Seedling: Steve Dewey, Utah State University, Bugwood.org
Fruit (seeds): Steve Dewey, Utah State University, Bugwood.org
Leaves: University of Idaho—Idaho Weed Resources
Flowers: Chris Evans, River to River CWMA, Bugwood.org
Rhizome: Steve Dewey, Utah State University, Bugwood.org

Hoary cress identification guide

Johnsongrass

Johnson grass

Seedling: Howard F. Schwartz, Colorado State University, Bugwood.org
Leaf collar: Chris Evans, River to River CWMA, Bugwood.org
Mature plant: Chris Evans, River to River CWMA, Bugwood.org
Rhizome: Steve Dewey, Utah State University, Bugwood.org
Leaf midrib: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.org
Seedhead: Ohio State Weed Lab Archive, The Ohio State University, Bugwood.

Johnsongrass identification guide

Kudzu

Kudzu

Seedlings: Nancy Fraley, USDI-NPS, Bugwood.org
Leaves: Ted Bodner, Southern Weed Science Society, Bugwood.org
Blue flower: Forrest and Kim Starr, USGS, Bugwood.org
Vines: James H. Miller, USDA-FS, Bugwood.org
Purple Flower: Ted Bodner, Southern Weed Science Society, Bugwood.org
Seed pods: Ted Bodner, Southern Weed Science Society, Bugwood.org

Kudzu identification guide

Leafy spurge

Leafy spurge

Young plant: Norman E. Rees, USDA-ARS—retired, Bugwood.org
Root buds: Steve Dewey, Utah State University, Bugwood.org
Fall color: William M. Ciesla, Forest Health Management International, Bugwood.org
Milky sap: Norman E. Rees, USDA-ARS—Retired, Bugwood.org
Crown stems: USDA-ARS Archive, USDA-ARS, Bugwood.org
Leaf bracts/blooms: Steve Dewey, Utah State University, Bugwood.org

Leafy spurge identification guide

Musk thistle

Musk thistle

Seedlings: Lynn Sosnoskie, University of Georgia, Bugwood.org
Leaf: Steve Dewey, Utah State University, Bugwood.org
Lower stem: Dan Tenaglia, Missouriplants.com, Bugwood.org
Rosette: © 2006 University of Illinois
Mature plant: James H. Miller, USDA-FS, Bugwood.

Musk thistle identification guide  |  Fall Musk thistle treatment

Pignut

Pignut

Young plant: Russ Kleinman, Western New Mexico University Department of Natural Sciences
Flowers: James M. Andre © 2004, CalPhotos
Leaves: James M. Andre © 2004, CalPhotos
Seed pods: Aaron Schusteff©2005, CalPhotos
Mature plant: James M. Andre @© 2004, CalPhotos

Pignut identification guide

Quackgrass

Quackgrass

Young plant: Russ Kleinman, Western New Mexico University Department of Natural Sciences
Leaf collar: ©2010, Province of British Columbia
Spikelets: Sari Agricultural Sciences and Natural Resources University
Seed head: Sari Agricultural Sciences and Natural Resources University
Rhizome growth: J. Dekker © 1999, Iowa State University
Mature plants: Adel Hamed Barhoum, Encyclopedia Natural Plants and Their Products
Rhizomes: © 2010, Province of British Columbia
Flowers: Ricky Layson, Ricky Layson Photography, Bugwood.org

Quackgrass identification guide

Russian knapweed

Russian knapweed

Rosette: Rodney G. Lym
Leaves: © 2006, University of Idaho Agricultural and Life Sciences
Flower bracts: Steve Dewey, Utah State University, Bugwood.org
Stem buds: K. George Beck, Colorado State University, Bugwood.org
Flowers: Steve Dewey, Utah State University, Bugwood.org
Mature plant: Missouri County Weed District

Russian knapweed identification guide

Sericea lespedeza

Sericea lespedeza

Seedlings: Chris Evans, River to River CWMA, Bugwood.org
Flowers: Dan Tenaglia, Missouriplants.com, Bugwood.org
Roots: Kansas Department of Agriculture
Leaves: James H. Miller, USDA-FS, Bugwood.org
Seed [email protected]: James H. Miller, USDA-FS, Bugwood.org
Mature plant: James H. Miller, USDA-FS, Bugwood.org

Sericea lespedeza identification guide