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 -  Fanwort  

Cylindrospermopsis raciborskii  - Cylindro  

Egeria densa  - Brazilian elodea, also known as Anacharis  

Fallopia japonica -  Japanese knotweed  

Heracleum mantegazzianum -  Giant Hogweed  

Hydrilla verticillata -  Hydrilla  

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 -  quackgrass  

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 -  dodder  

Cyperus esculentus, both seed and tubers -  yellow nutsedge, chufa  

Euphorbia esula -  leafy spurge  

Ipomea species -  morning glory  

Nasella trachoma -  serrated tussock  

Solanum carolinense -  horsenettle  

Sonchus arvensis -  perennial sowthistle  

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

Tribulus terrestris -  puncturevine  


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

Abutilon theophrasti -  Velvetleaf  

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 - Jimsonweed  

Daucus carota -  Wild carrot  

Plantago lanceolata -  Buckhorn plaintain  

Raphanus raphanistrum  - Wild radish  

Rumex crispus -  Curled dock  

Seteria faberii -  Giant foxtail  

Sinapis arvensis -  Charlock  

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  

Thlaspi arvense -  Fanweed - Deregulated as of December 2015

Xanthium strumarium -  Cocklebur  

Additional Information: 

Michigan Invasive Species Website