Norwalk's Invasive Plant Rules: The Rules That Matter

Every city handles invasive plant rules a little differently. In Norwalk, California, there are 2 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Prohibited Species

Norwalk's Water Efficient Landscape Ordinance defines invasive plant species as plants not historically found in California that spread outside cultivated areas and damage environmental or economic resources, and it strongly discourages using them, such as those on the California Invasive Plant Council's list, in any new or rehabilitated landscape design plan.

Key details: Governing section: Municipal Code § 17.03.020(E)(1)(f). Applies to: New/rehabilitated landscape projects, 2,500+ sq ft. Standard: "Strongly discouraged," not banned. Reference list: California Invasive Plant Council. Reviewing department: Department of Community Development.

Section 17.03.020's invasive-species language is a discouragement within the landscape design plan requirements, not an independent prohibition; noncompliance is addressed through the plan review and approval process for the landscape documentation package rather than as a separate citable offense, since the ordinance does not attach its own penalty to subsection E(1)(f).

Norwalk is more permissive than most cities when it comes to prohibited species. That said, there are still limits.

Tree-of-Heaven Removal

Norwalk's Street Tree Ordinance names Ailanthus, commonly called tree of heaven, among the species it flatly bars from being planted in any street or public place. Municipal Code Section 12.32.240 lists it alongside Poplar, Willow, Cottonwood, Mountain Ash and Bigleaf Maple as prohibited trees maintained on a public list by the Director of Public Services.

Key details: Governing section: Municipal Code § 12.32.240. Species named: Ailantus (tree of heaven). Where banned: Streets and public places only. List maintained by: Director of Public Services. Permit cross-reference: Enforced via § 12.32.070 permit gate.

Planting a prohibited tree such as Ailantus in a street or public place without Director authorization is enforceable as a violation of Chapter 12.32's permit requirement in Section 12.32.070, punishable as a misdemeanor under Chapter 1.16, up to a $1,000 fine and up to six months in County Jail, and the City may require removal and replacement with an approved species at the property owner's cost.

The Bottom Line

Norwalk's invasive plant rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Norwalk is broadly strict or permissive.

These rules come from Norwalk's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.