Invasive Plant Rules in Marin County, CA (2026)
1 rule for unincorporated Marin County, California.
Verified from official government sources
Note: These county rules apply to unincorporated areas of Marin County. If you live within an incorporated city, that city's own rules apply: see the city list below.
Prohibited Species
Marin County Code Section 6.60.010 makes it unlawful to knowingly let 13 named noxious weeds, including Canada thistle, Russian knapweed, and puncture vine, grow on land you own. Violating the 1959 ordinance is a misdemeanor under Section 6.60.020, punishable by a fine capped at fifty dollars.
Marin County Noxious Weed Ban: 13 Listed Species
Some RestrictionsMarin County Code § 6.60.010 (Noxious Weeds Listed)
6.60.010 - Noxious weeds listed. It shall be unlawful for any person owning land within the county of Marin to knowingly permit the following noxious or deleterious weeds to exist, grow or mature upon land owned by such person: Russian thistle, puncture vine, hoary cress, Austrian field cress, Klamath weed, white horse-nettle, creeping sow thistle, milk thistle, bull thistle, Canada thistle, It...
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