What are noxious weeds in Washington state? Noxious & Invasive Non-Native Plants
English ivy, knotweeds, Scot’s broom, and tansy ragwort are extensive problems west of the Cascades. Knapweeds, leafy spurge, thistles and many others degrade eastern portions of the state. Loosestrife, milfoil, and parrotfeather clog waterways.
How do I know if I have noxious weeds?
- If they are poisonous plants.
- If they are plants that are irritants.
- If they produce a lot of pollen, as does common ragweed.
What plants are illegal in Washington state?
- Yellow flag iris (Iris pseudacorus).
- Annual bugloss (Lycopsis arvensis).
- Hoary alyssum (Berteroa incana).
- Italian arum (Arum Italicum).
- Myrtle spurge (Euphorbia myrsinites).
- Poison hemlock (Conium maculatum).
- Ravenna grass (Tripidium ravennae).
What are the most common garden weeds?
- Crabgrass (Digitaria spp.) Crabgrass.
- Purslane (Portulaca oleracea)
- Lambsquarters (Chenopodium album)
- Pigweed (Amaranthus spp.)
- Chickweed (Stellaria sp.
- Dandelion (Taraxacum officinale)
- Shepherd’s Purse (Capsella bursa-pastoris)
- Creeping Charlie (Glechoma hederacea)