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Prohibited and Restricted Weeds

Michigan laws regulate the possession and sale of certain plant species which are considered undesirable from agricultural as well as environmental viewpoints.  These unwanted species are listed below according to the applicable laws and regulations.

A. Prohibited Plant Species (Natural Resources and Environmental Protection Act (Act 451 of 1994, as amended)

Prohibited species identified under this Act cannot be sold or grown in the state. Any of the following plants, fragments, seeds or a hybrid or genetically engineered variant thereof are specifically prohibited.

Cabomba caroliniana 


Cylindrospermopsis raciborskii


Egeria densa

Brazilian elodea, also known as Anacharis

Fallopia japonica

Japanese knotweed

Heracleum mantegazzianum

Giant Hogweed

Hydrilla verticillata


Hydrocharis morsus-ranae

European frogbit

Lagarosiphon major

African oxygen weed

Myriophyllum aquaticum

Parrot's Feather

Nitellopsis obtusa

Starry Stonewort

Nymphoides peltata

Yellow Floating Heart

Salvinia molesta, auriculata, biloba, or herzogii

Giant Salvinia

Trapa natans

Water Chestnut

B. Restricted Plant Species (Natural Resources and Environmental Protection Act (Act 451 of 1994, as amended)

Restricted species under this Act are those that may occur within the state and are generally considered as nuisances or economically detrimental.

Any of the following plants, fragments, seeds or a hybrid or genetically engineered variant thereof are restricted. 

Butomus umbellatus

Flowering Rush

Lythrum salicaria

Purple Loosestrife

Myriophyllum spicatum

Eurasian Watermilfoil

Phragmites australis

Phragmites or Common Reed

Potamogeton crispus

Curly Leaf Pondweed

C. Noxious Weeds (Michigan Seed Law (Act 329 of 1965) and Regulations 715 (Under Act 329) Seed Law Implementation

1. Prohibited noxious weeds - Seeds of these species are prohibited as contaminants in seed offered for sale.

Agropyron repens = Elytrigia repens


Cardaria draba

whitetop = hoary cress = perennial peppergrass

Carduus acanthoides

plumeless thistle

Carduus nutans

musk thistle

Centaurea maculosa

spotted knapweed

Centaurea picris

Russian knapweed

Cirsium arvense

Canada thistle

Cirsium vulgare

bull thistle

Convolvulus arvensis

field bindweed

Convolvulus sepium

hedge bindweed

Cuscuta spp


Cyperus esculentus, both seed and tubers

yellow nutsedge, chufa

Euphorbia esula

leafy spurge

Ipomea species

morning glory

Nasella trachoma

serrated tussock

Solanum carolinense


Sonchus arvensis

perennial sowthistle

Sorghum halapense, including sorghum almum and seed which cannot be distinguished from johnsongrass


Tribulus terrestris


2. Restricted noxious weed seeds - Generally the limit is one seed per 2000 of agricultural seed offered for sale.              

Abutilon theophrasti


Allium canadense

Wild onion

Allium vineale

Wild garlic

Avena fatua

Wild oat

Barbarea vulgaris

Yellow rocket

Berteroa incana

Hoary alyssum

Brassica juncea

Indian mustard

Brassica nigra

Black mustard

Datura stramonium


Daucus carota

Wild carrot

Plantago lanceolata

Buckhorn plaintain

Raphanus raphanistrum

Wild radish

Rumex crispus

Curled dock

Seteria faberii

Giant foxtail

Sinapis arvensis


Solanum species: including all of the following species and any other species with indistinguishable seed:

Nightshade complex

Solanum dulcamara

Bitter nightshade

Solanum eleagnifolium

Silver leaf nightshade

Solanum nigrum

Black nightshade

Solanum ptycanthum

Eastern black nightshade

Solanum sarrachoides

Hairy nightshade

Thalspi arvense


Xanthium strumarium


Additional Information: 

Department of Natural Resources - Invasive Species Website


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