Iowa Primary and Secondary Noxious Weed List

List prepared by Bob Hartzler, extension weed management specialist, Department of AgronomyIowa State University

For more in-depth information and photos visit:   

ISU Extension Agronomy
2104 Agronomy Hall
Ames, Iowa 50011-1010
Voice: (515) 294-1923
Fax: (515) 294-9985

The following information is a list of Iowa Primary and Secondary Noxious Weeds created by Extension Weed Management Specialist Bob Hartzler . Visit the page for further information:

Primary noxious weeds 1                                                            Secondary noxious weeds1

quackgrass (Agropyron repens)                                        velvetleaf (Abutilon theophrasti)

perennial sowthistle (Sonchus arvensis)                            cocklebur (Xanthium commune)

Canada thistle (Cirsium arvense)2                                    wild mustard (Brassica arvensis)

bull thistle (Cirsium lanceolatum)2                                    wild carrot (Daucus carota)

field bindweed (Convolvulus arvensis)                               sheep sorrel, red sorrel (Rumex acetosella)

horsenettle (Solanum carolinense),                                   sour dock , curly dock (Rumex crispus)

leafy spurge (Euphorbia esula)                                          smooth dock (Rumex altissimus)

perennial pepper-grass, hoary cress (Lepidium draba)         poison hemlock (Conium maculatum)

Russian knapweed (Centaurea repens)                               multiflora rose (Rosa multiflora)

buckthorn (not to include Rhamnus frangula)                      wild sunflower (Helianthus annus L.)

musk thistle (Carduus nutans)2                                          puncturevine (Tribulus terrestris)

tall thistle (Cirsium altissimum)2                                         teasel (Dipsacus spp.)

                                                                                        shattercane (Sorghum bicolor)

                                                                                        buckhorn plantain (Plantago lanceolata)                                                                                           

1 The botanical names listed on this page are reproduced as found in the Iowa Weed Law.  Several names have been changed (e.g. quackgrass, cocklebur) since the Weed Law was last revised.

The Iowa Weed Law states that all thistles in the Carduus and Cirsium genus are considered noxious, so several other thistles of lesser importance are included in the law.