Noxious Weeds Listed in code
317.1A Noxious weeds.
1. The following weeds are hereby declared to be noxious and shall be divided into two
classes, as follows:
a. Primary noxious weeds, which shall include:
(1) Quack grass (Elymus repens).
(2) Perennial sow thistle (Sonchus arvensis).
(3) Canada thistle (Cirsium arvense).
(4) Bull thistle (Cirsium vulgare).
(5) European morning glory or field bindweed (Convolvulus arvensis).
(6) Horse nettle (Solanum carolinense).
(7) Leafy spurge (Euphorbia esula).
(8) Perennial pepper-grass (Cardaria draba).
(9) Russian knapweed (Acroptilon repens).
(10) Buckthorn (Rhamnus spp., not to include Frangula alnus, syn. Rhamnus frangula).
(11) All other species of thistles belonging in the genera of Cirsium and Carduus.
b. Secondary noxious weeds, which shall include:
(1) Butterprint (Abutilon theophrasti) annual.
(2) Cocklebur (Xanthium strumarium) annual.
(3) Wild mustard (Sinapis arvensis) annual.
(4) Wild carrot (Daucus carota) biennial.
(5) Buckhorn (Plantago lanceolata) perennial.
(6) Sheep sorrel (Rumex acetosella) perennial.
(7) Sour dock (Rumex crispus) perennial.
(8) Smooth dock (Rumex altissimus) perennial.
(9) Poison hemlock (Conium maculatum).
(10) Multiflora rose (Rosa multiflora).
(11) Wild sunflower (wild strain of Helianthus annuus L.) annual.
(12) Puncture vine (Tribulus terrestris) annual.
(13) Teasel (Dipsacus spp.) biennial.
(14) Shattercane (Sorghum bicolor) annual.
2. a. The multiflora rose (Rosa multiflora) shall not be considered a secondary noxious
weed when cultivated for or used as understock for cultivated roses or as ornamental shrubs
in gardens, or in any county whose board of supervisors has by resolution declared it not to
be a noxious weed.
b. Shattercane (Sorghum bicolor) shall not be considered a secondary noxious weed when
cultivated or in any county whose board of supervisors has by resolution declared it not to be
a noxious weed.
317.25 Invasive plants prohibited — exception — penalty.
1. a. A person shall not import, sell, offer for sale, or distribute in this state in any form,
including the seeds, any of the following plants:
(1) Teasel (Dipsacus) biennial.
(2) Multiflora rose (Rosa multiflora).
(3) Purple loosestrife (Lythrum salicaria).
(4) Purple loosestrife (Lythrum virgatum).
(5) Garlic mustard (Alliaria petiolata).
(6) Oriental bittersweet (Celastrus orbiculatus).
(7) Japanese knotweed (Fallopia japonica).
(8) Japanese hop (Humulus japonicus).
b. However, paragraph “a” does not prohibit the sale, offer for sale, or distribution of the
multiflora rose (Rosa multiflora) used for understock for either cultivated roses or ornamental
shrubs in gardens.
21—58.1(317) Definition. As used in this chapter, “sterile” means any plant or variety that is incapable
of reproduction or which is either noninvasive or nonaggressive in that the plant does not spread
into areas where it was not initially planted.
21—58.2(317) Purple loosestrife. The following Lythrum (purple loosestrife) cultivars are derived
from Lythrum virgatum that are sterile or nonaggressive and can be sold for planting in ornamental
1. Rose queen
2. The rocket
3. Morden pink
4. Morden gleam
5. Morden rose
6. Dropmore purple
7. Columbia pink
Any person selling or offering for sale any or all of the above-listed varieties shall prominently display
a sign to inform purchaser it is legal to plant the above-listed Lythrum virgatum in “ornamental