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