All plants, plant parts, and seeds in packets, blends, and "wildflower mixes" of the following listed species are regulated under the terms of this noxious weed seed and plant quarantine:
| Scientific Name | Common Names |
| Abutilon theophrasti | velvetleaf |
| Alliaria petiolata | garlic mustard |
| Amorpha fruticosa | indigobush, lead plant |
| Anchusa officinalis | common bugloss, alkanet, anchusa |
| Anthriscus sylvestris | wild chervil |
| Brachypodium sylvaticum | false brome |
| Carduus acanthoides | plumeless thistle |
| Carduus nutans | musk thistle, nodding thistle |
| Carduus pycnocephalus | Italian thistle |
| Carduus tenuiflorus | slenderflower thistle |
| Centaurea calcitrapa | purple starthistle |
| Centaurea diffusa | diffuse knapweed |
| Centaurea jacea | brown knapweed, rayed knapweed, brown centaury horse-knobs, hardheads |
| Centaurea jacea x nigra | meadow knapweed |
| Centaurea biebersteinii | spotted knapweed |
| Centaurea macrocephala | bighead knapweed |
| Centaurea nigra | black knapweed |
| Centaurea nigrescens | Vochin knapweed |
| Chaenorrhinum minus | dwarf snapdragon |
| Crupina vulgaris | common crupina |
| Cytisus scoparius | Scotch broom |
| Daucus carota | wild carrot, Queen Anne's lace |
| Echium vulgare | blueweed, blue thistle, blue devil, viper's bugloss, snake flower |
| Euphorbia esula | leafy spurge |
| Euphorbia oblongata | eggleaf spurge |
| Galega officinalis | goatsrue |
| Geranium lucidum | shiny geranium |
| Helianthus ciliaris | Texas blueweed |
| Heracleum mantegazzianum | giant hogweed, giant cow parsnip |
| Hibiscus trionum | Venice mallow, flower-of-an-hour, bladder ketmia, modesty, shoo-fly |
| Hieracium aurantiacum | orange hawkweed, orange paintbrush, red daisy flameweed, devil's weed, grim-the-collier |
| Hieracium caespitosum | yellow hawkweed, yellow paintbrush, devil's paintbrush, yellow devil, field hawkweed, king devil |
| Hieracium floribundum | yellow devil hawkweed |
| Hieracium pilosella | mouseear hawkweed |
| Hieracium sabaudum | European hawkweed |
| Impatiens glandulifera | policeman's helmet |
| Isatis tinctoria | dyers' woad |
| Kochia scoparia | kochia, summer-cyprus, burning-bush, fireball, Mexican fireweed |
| Lepidium latifolium | perennial pepperweed |
| Leucanthemum vulgare | oxeye daisy, white daisy, whiteweed, field daisy, marguerite, poorland flower |
| Linaria dalmatica spp. dalmatica | Dalmatian toadflax |
| Mirabilis nyctaginea | wild four o'clock, umbrella-wort |
| Onopordum acanthium | Scotch thistle |
| Polygonum cuspidatum | Japanese knotweed |
| Polygonum polystachyum | Himalayan knotweed |
| Polygonum sachalinense | giant knotweed |
| Polygonum x bohemicum | Bohemian knotweed, Japanese and giant knotweed hybrid |
| Proboscidea louisianica | unicorn-plant |
| Pueraria montana var. lobata | kudzu |
| Salvia aethiopis | Mediterranean sage |
| Salvia pratensis | meadow clary |
| Salvia sclarea | clary sage |
| Senecio jacobaea | tansy ragwort |
| Silybum marianum | milk thistle |
| Solanum elaeagnifolium | silverleaf nightshade |
| Solanum rostratum | buffaloburr |
| Soliva sessilis | lawnweed |
| Sorghum halepense | johnsongrass |
| Spartium junceum | Spanish broom |
| Tamarix ramosissima | saltcedar |
| Thymelaea passerina | spurge flax |
| Torilis arvensis | hedgeparsley |
| Ulex europaeus | gorse, furze |
| Zygophyllum fabago | Syrian bean-caper |
This list is comprised of the most recent and accepted scientific and common names of the quarantine plant species. Regulated status also applies to all synonyms of these botanical names.
[Statutory Authority: Chapters 17.10, 17.24, and 34.05 RCW. 09-19-006, § 16-752-610, filed 9/3/09, effective 10/4/09; 04-19-004, § 16-752-610, filed 9/2/04, effective 10/3/04. Statutory Authority: Chapters 17.24, 17.10, 15.13 RCW. 02-12-030, § 16-752-610, filed 5/29/02, effective 6/29/02. Statutory Authority: Chapters 17.24, 17.10 RCW. 00-24-021, § 16-752-610, filed 11/28/00, effective 12/29/00; 98-13-008, § 16-752-610, filed 6/4/98, effective 7/5/98. Statutory Authority: Chapters 17.10 and 17.24 RCW. 92-07-025, § 16-752-610, filed 3/10/92, effective 4/10/92.]