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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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