Invasive Plant Rules in Multnomah County, OR (2026)
1 county-level rule, plus city-specific rules for 2 cities in Multnomah County, Oregon.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Multnomah County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Prohibited Species
Unincorporated Multnomah County's SEC-h wildlife-habitat overlay bans planting nuisance and invasive nonnative plants and requires their removal from cleared areas as a development-permit condition. Portland and its own municipal code are not covered by this rule.
Multnomah County Bans Invasive Plants in Wildlife Habitat
Some RestrictionsMultnomah County Code § 39.5540(C)(1)(e)
(e) Nuisance and invasive nonnative plants, as defined in MCC 39.5540 shall not be planted on the subject property and shall be removed and kept removed from cleared areas of the subject property. (f) Ground disturbing activity within 100 feet of a water body as defined by MC 39.2000 shall be limited to the period between May 1st and September 15th. Revegetation and soil stabilization must be a...
Invasive Plant Rules by City in Multnomah County
2 cities in Multnomah County have their own invasive plant rules rules. Each link goes to that city's dedicated page with code citations.
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