Prohibited Species: Bellevue vs Seattle
How do prohibited species rules compare between Bellevue, WA and Seattle, WA?
Seattle has fewer restrictions than Bellevue.
Bellevue, WA
King County
The King County Noxious Weed Control Board enforces control of noxious weeds classified as Class A, B, and C under RCW 17.10. Class A weeds must be eradicated by all property owners. Class B and C control varies. The county maintains a 'Weeds of Concern' list for non-regulated invasive species. King County also has the authority under KCC 21A.24 to regulate vegetation in critical areas.
View full Bellevue rules →Seattle, WA
King County
Seattle follows the Washington State Noxious Weed List and King County's noxious weed regulations. Property owners must control Class A, B, and C noxious weeds. Common prohibited species include knotweed, Scotch broom, English ivy, and Himalayan blackberry.
View full Seattle rules →Key Facts Comparison
| Fact | Bellevue | Seattle |
|---|---|---|
| Authority | RCW 17.10 / Weed Board | RCW 17.10 and King County regulations |
| Class A | Eradication required (e.g., giant hogweed) | Must be eradicated (giant hogweed, garlic mustard) |
| Class B | Selective control (e.g., knotweed) | Must be controlled (knotweed, Scotch broom) |
| Key Invasives | English ivy, blackberry, Scotch broom | - |
| Class C | - | Recommended removal (English ivy) |
Highlighted rows indicate differences between cities.
Bellevue FAQ
What plants are prohibited in King County?
Class A noxious weeds must be eradicated by law, including giant hogweed and floating primrose willow. Class B weeds like invasive knotweed require control in certain areas. The Washington State Prohibited Plants List bans sale/transport of additional species.
Do I have to remove English ivy from my property in King County?
No. English ivy is a Class C noxious weed in King County — control is encouraged but not required. However, if you are restoring vegetation in a critical area (wetland, stream buffer), invasive species like ivy must be replaced with native plantings.
Seattle FAQ
What plants are illegal in Seattle?
Washington state Class A noxious weeds like giant hogweed, garlic mustard, and purple loosestrife must be eradicated. Class B weeds like Japanese knotweed and Scotch broom must be controlled. King County may add additional species.
Who enforces noxious weed laws in Seattle?
King County's Noxious Weed Control Program enforces weed laws within Seattle. The Washington State Noxious Weed Control Board sets statewide classifications.
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