Noxious Weed Seed

Prohibited and Restricted Noxious Weed Seeds Michigan law regulates the sale, advertising, or transport of certain noxious weeds. Noxious weed seeds are generally considered to be serious 7 CFR § 201.52 – Noxious-weed seeds. (a) The determination of the number of seeds, bulblets, or tubers of individual noxious weeds present per unit weight should be made on at least the minimum The following list is current as of February 2021.

Prohibited and Restricted Noxious Weed Seeds

Michigan law regulates the sale, advertising, or transport of certain noxious weeds. Noxious weed seeds are generally considered to be serious nuisances or economically detrimental and are divided into two categories. Prohibited noxious weed seed cannot be sold or transported in the state. Restricted noxious weed seeds are only permitted when strict limits on the percentage or number of such seeds found in any lot of seed are observed.

The various Acts and Regulations that pertain to the sale or transport of seed consisting of or containing noxious weeds are summarized below:

A complete list of the prohibited and restricted noxious weed seeds covered by Regulation 715 follows:

The number of restricted noxious weed seeds that may be found in any particular lot of seed is limited to 1 seed of any or all of the restricted noxious weed seeds to 2,000 seeds of the seed sold, offered, exposed, or transported for sale, except that for buckhorn and yellow rocket, the limit shall be 1 seed to 1,000 seeds of the seed sold, offered, exposed, or transported for sale.

If present in a lesser ratio, the seed consisting of or containing the restricted noxious weeds may be sold, provided that the name of the restricted noxious weed(s) must be named on the tag together with the number of the restricted weed seeds per pound, unless they are buckhorn or yellow rocket. If the restricted noxious weeds are either of these, they need not be shown on the tag unless they exceed 90 seeds per pound.

7 CFR § 201.52 – Noxious-weed seeds.

(a) The determination of the number of seeds, bulblets, or tubers of individual noxious weeds present per unit weight should be made on at least the minimum quantities listed in § 201.46 Table 1: Provided, That if the following indicated numbers of a single kind of seed, bulblet, or tuber are found in the pure seed analysis (or noxious-weed seed examination of a like amount) the occurrence of that kind in the remainder of the bulk examined for noxious-weed seeds need not be noted: 1/2 -gram purity working sample, 16 or more seeds; 1-gram purity working sample, 23 or more seeds; 2-gram purity working sample or larger, 30 or more seeds. The seeds per unit weight shall be based on the number of single seeds. The number of individual seeds shall be determined in burs of sandbur ( Cenchrus spp.) and cocklebur ( Xanthium spp.); in capsules of dodder ( Cuscuta spp.); in berries of groundcherry, horsenettle, and nightshade (Solanaceae); and in the fruits of other noxious weeds that contain more than one seed. Refer to §§ 201.50 and 201.51(b)(4) for the classification of weed seeds and inert matter, respectively.

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(b) A noxious-weed seed examination of coated seed samples shall be made by examining approximately 25,000 units obtained in accordance with § 201.46(d) and which have been de-coated by the method described in § 201.51b(c).

Prohibited and Restricted Noxious Weed List

In accordance with Section 52332 of the Food and Agricultural Code, the Director hereby designates the seed or propagule of the following species* of plants to be prohibited noxious weed seed within the meaning of Section 52257 of the Food and Agricultural Code:

Acaena anserinifolia (bronze piri-piri-bur)
Acaena novae-zelandiae (biddy biddy)
Acaena pallida (pale biddy biddy)
Achnatherum brachychaetum (punagrass)
Aegilops cylindrica (jointed goatgrass)
Aegilops geniculata (ovate goatgrass)
Aeschynomene spp. (jointvetch)
Alhagi maurorum (camelthorn)
Alternanthera sessilis (sessile joyweed)
Arctotheca calendula (capeweed)
Atriplex amnicola (river saltbush)
Carduus acanthoides (plumeless thistle)
Carduus crispus (welted thistle)
Carduus nutans (musk thistle)
Carthamus leucocaulos (whitestem distaff thistle)
Cenchrus echinatus (southern sandbur)
Cenchrus incertus (coast sandbur)
Cenchrus longispinus (mat sandbur)
Centaurea diffusa (diffuse knapweed)
Centaurea iberica (Iberian starthistle)
Centaurea jacea incl C. pratensis (meadow knapweed)
Centaurea stoebe (spotted knapweed)
Centaurea sulphurea (Sicilian thistle)
Centaurea virgata (squarrose knapweed)
Cirsium arvense (Canada thistle)
Cirsium undulatum (wavyleaf thistle)
Crupina vulgaris (bearded creeper)
Cucumis melo var. dudaim (dudaim melon)
Euphorbia terracina (carnation spurge)
Euphorbia virgata (leafy spurge)
Galega officinalis (goat’s rue)
Halimodendron halodendron (Russian salt tree)
Halogeton glomeratus (halogeton)
Helianthus ciliaris (blueweed)
Isatis tinctoria (dyer’s woad)
Lepidium appelianum (lens-podded hoary cress)
Lepidium chalepense (heart-podded hoary cress)
Lepidium draba (globe-podded hoary cress)
Lepidium latifolium (perennial pepperweed)
Ludwigia decurrens (winged water-primrose)
Ludwigia grandiflora ssp. hexapetala (Uruguayan water-primrose)
Ononis alopecuroides (fox tail restharrow)
Onopordum spp. (onopordum thistles)
Orobanche ramosa (branched broomrape)
Parthenium hysterophorus (Santa Maria feverfew)
Rhagadiolus stellatus (star endive)
Rhaponticum (Acroptilon) repens (Russian knapweed)
Rorippa austriaca (Austrian fieldcress)
Salsola damascena (Damascus saltwort)
Sesbania punicea (red rattlebox)
Solanum carolinense (Carolina horsenettle)
Solanum elaeagnifolium (white horsenettle)
Sonchus arvensis (perennial sowthistle)
Tribolium obliterum (Cape grass)

*Botanical names may not reflect currently accepted nomenclature which is not always corrected immediately in the official text of the California Code of Regulations.

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Restricted Noxious Weed Seed

In accordance with Section 52332 of the Food & Agricultural Code, the Director hereby designates the seed or propagule of the following species* of plants to be Restricted noxious weed seed within the meaning of Section 52258 of the Food and Agricultural Code:

Acacia paradoxa (Kangaroo thorn)
Aegilops triuncialis (barb goatgrass)
Ailanthus altissima (tree of heaven)
Allium paniculatum (panicled onion)
Allium vineale (wild garlic)
Alternanthera philoxeroides (alligatorweed)
Ambrosia trifida (giant ragweed)
Araujia sericifera (bladderflower)
Arundo donax (giant reed)
Asphodelus fistulosus (onionweed)
Berteroa incana (hoary alyssum)
Brachypodium sylvaticum (slender false-brome)
Cabomba caroliniana (Carolina fanwort)
Carduus pycnocephalus (slender-flowered thistle)
Carduus tenuiflorus (Italian thistle)
Carthamus baeticus (smooth distaff thistle)
Carthamus lanatus (woolly distaff thistle)
Centaurea calcitrapa (purple starthistle)
Centaurea melitensis(tocalote)
Centaurea solstitialis (yellow starthistle)
Ceratopteris thalictroides (watersprite)
Chondrilla juncea (skeletonweed)
Chorispora tenella (purple mustard)
Cirsium japonicum (Japanese thistle)
Cirsium ochrocentrum (yellowspine thistle)
Cirsium vulgare (bull thistle)
Coincya monensis (star-mustard)
Convolvulus arvensis (field bindweed)
Cortaderia jubata (jubata grass)
Cucumis myriocarpus (paddy melon)
Cuscuta spp. (dodder)
Cynara cardunculus (artichoke thistle)
Cyperus esculentus (yellow nutsedge)
Cyperus rotundus (purple nutsedge)
Cytisus scoparius (Scotch broom)
Diodia virginiana(buttonweed)
Dittrichia graveolens (stinkweed)
Drymaria cordata (whitesnow, tropical chickweed)
Egeria najas (anacharis)
Elymus repens (=Elytrigia repens)(quackgrass)
Euphorbia graminea (grassleaf spurge)
Euphorbia dendroides (tree spurge)
Euphorbia oblongata (oblong spurge)
Euphorbia serrata (serrate spurge)
Fallopia Xbohemica (=Reynoutria Xbohemica; Polygonum Xbohemica (Bohemian knotweed)
Fallopia japonica (=Polygonum cuspidatum; Reynoutria j.) (Japanese knotweed)
Fallopia sachalinensis (=Polygonum s.; Reynoutria s.) (giant knotweed)
Fatoua villosa (hairy crabweed)
Genista monspessulana (French broom)
Heteropogon contortus (tanglehead)
Hydrilla verticillata (hydrilla)
Hydrocharis morsus-ranae (Frogbit)
Hygrophila polysperma (Indian swampweed)
Hyoscyamus niger (black henbane)
Hypericum canariense (Canary Island St. Johnswort)
Hypericum perforatum (Klamath weed)
Lagarosiphon major (oxygen weed, African elodea)
Lepidium coronopus (=Coronopus squamatus)(swinecress)
Leptochloa chinensis (=Dinebra c.)(Chinese sprangletop)
Limnobium laevigatum (South American spongeplant)
Limnobium spongia (American spongeplant, American frog’s-bit)
Limnophila indica (Indian marshweed)
Limnophila sessiliflora (Asian marshweed)
Linaria dalmatica (Dalmatian toadflax)
Ludwigia peruviana (Peruvian primrose-willow)
Lythrum salicaria (purple loosestrife)
Mercurialis ambigua (Spanish mercury)
Muhlenbergia schreberi (nimblewill)
Myosoton aquaticum (giant chickweed)
Nothoscordum gracile (false garlic)
Nymphaea mexicana (banana waterlily)
Nymphoides peltata (yellow floating heart)
Oenothera xenogaura (=Gaura drummondii)(Drummond’s gaura)
Oenothera sinuosus (=Gaura sinuata)(wavyleaf gaura)
Oryza rufipogon (red rice)
Panicum antidotale (blue panicgrass)
Peganum harmala (harmel)
Persicaria wallichii (=P. polystachyum; Rubrivena polystachya)(Himalayan knotweed)
Pennisetum clandestinum (Kikuyugrass)
Physalis virginiana var. sonorae (smooth groundcherry)
Physalis viscosa (grape groundcherry)
Potentilla recta (sulphur cinquefoil)
Prosopis strombulifera (creeping mesquite)
Retama monosperma (bridal veil broom)
Rorippa sylvestris (creeping yellowcress)
Saccharum ravennae (ravennagrass)
Salsola tragus (common Russianthistle)
Salsola collina (spineless Russian thistle)
Salsola paulsenii (barbwire Russianthistle)
Salvia aethiopis (Mediterranean sage)
Salvia virgata (meadow sage)
Salvinia auriculata s.l. (giant salvinia)
Scolymus hispanicus (golden thistle)
Senecio jacobaea (=Jacobaea vulgaris)(tansy ragwort)
Senecio linearifolius (fireweed groundsel)
Senecio squalidus (Oxford ragwort)
Setaria faberi (giant foxtail)
Solanum cardiophyllum (heartleaf nightshade)
Solanum dimidiatum (Torrey’s nightshade)
Solanum lanceolatum (lanceleaf nightshade)
Solanum marginatum (white-margined nightshade)
Sorghum halepense (Johnsongrass and other perennial Sorghum spp. including but not limited to Sorghum almum and perennial sweet sudangrass)
Spartina alterniflora and hybrids (smooth cordgrass and hybrids)
Spartina anglica (common cordgrass)
Spartina densiflora (dense-flowered cordgrass)
Spartina patens (saltmeadow cord grass)
Spartium junceum (Spanish broom)
Sphaerophysa salsula (Austrian peaweed)
Striga lutea (witchweed)
Symphytum asperum (rough comfrey)
Taeniatherum caput-medusae (medusahead)
Tagetes minuta (wild marigold)
Tamarix chinensis (salt cedar)
Tamarix gallica (salt cedar)
Tamarix parviflora (salt cedar)
Tamarix ramosissima (salt cedar)
Tribulus terrestris (puncture vine)
Ulex europaeus (gorse)
Viscum album (European mistletoe)
Volutaria canariensis (Canary Island knapweed)
Zostera japonica (dwarf eelgrass)
Zygophyllum fabago (Syrian beancaper)

*Botanical names may not reflect currently accepted nomenclature which is not always corrected immediately in the official text of the California Code of Regulations.

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Mailing address:
California Crop Improvement Association
Parsons Seed Certification Center
University of California
One Shields Avenue
Davis, CA 95616-8540