Marysville, WA Invasive Plant Rules: Prohibited Species (2026)
Key Facts
- Prohibited species list
- Maintained by the city
- Basis
- Invasive or noxious status
- Existing infestations
- Removal required for approval
- Governing section
- MMC § 22C.120.050(2)(d)
Summary
Marysville maintains a list of prohibited invasive and noxious plant species for landscaped development and requires removal of any that already exist on site as a condition of development approval.
Prohibited Species. The city shall maintain a list of prohibited species, which are invasive or noxious. Where such species already exist, their removal shall be a condition of development approval.
(e) Additional Planting Standards.
(i) For xeriscape areas, soil samples shall be analyzed to determine what soil conditioning or soil amendments should be used at the time of planting. Soil conditioning measures shall be adequate for the plant species selected.
(ii) Trees, shrubs, perennials, perennial grasses and ground covers shall be located and spaced to accommodate their mature size on the site.
(f) Plant Replacement. The developer shall maintain xeriscape plantings for a two-year period from the date of planting. Within the two-year period, the developer shall replace or otherwise guarantee any failed plantings:
(i) Dead or dying trees or shrubs shall be replaced; and
(ii) Plantings or perennials, perennial grasses or ground covers shall be replanted to maintain a maximum 20 percent mortality rate from the date of planting.
(3) Storm Water. Applicants are encouraged to incorporate landscaping into the on-site storm water treatment system to the greatest extent practicable. (Ord. 2852 § 10 (Exh. A), 2011; Ord. 3352 § 83 (Exh. BBBB), 2025; Ord. 3366 § 80 (Exh. BBBB), 2025)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4922912; v1 updated 2026-06-08; through 06-08-2026).
Full Breakdown
Marysville Municipal Code § 22C.120.050(2)(d) directs the community development department to maintain a list of prohibited species, plants classified as invasive or noxious, that cannot be used in required landscaping. Where prohibited species already exist on a development site, the code makes their removal a mandatory condition of development approval rather than a suggestion. The rule sits alongside the xeriscape native-plant standard in the same section, reinforcing that new landscaping must avoid invasive stock and that existing invasive growth must be cleared before a project can move forward.
Violations & Fines
A development application with an unresolved prohibited-species condition does not receive approval; the community development department withholds sign-off until removal is completed or guaranteed.
Frequently Asked Questions
Where can I find the city's prohibited species list?
What if invasive species already grow on my development site?
Sources & Official References
Other rules in Marysville
Compare Marysville to another location·View the Washington invasive plant rules overview
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Prohibited Species in Nearby Cities
How other cities in Snohomish County handle prohibited species.