Invasive Plant Rules in Portland, OR: What Residents Actually Need to Know

If you live in Portland or are thinking about moving there, invasive plant rules are one of those things you probably won't think about until they affect you directly. Portland has 2 specific rules on the books covering different aspects of invasive plant rules, and some of them might surprise you.

Tree-of-Heaven Removal

Portland requires property owners to eradicate tree-of-heaven and every other species on the City's Nuisance Plants List under Code Section 29.20.010.G, enforced through the same nuisance-abatement process used for overgrown lawns and rat harborage.

Key details: Code section: Section 29.20.010.G, Property Nuisances. Covered species: All plants on Nuisance Plants List. Required action: Full removal: roots, shoots, seeds. Enforcement: Summary abatement, no notice required.

Failure to eradicate a listed plant like tree-of-heaven is a nuisance under Section 29.20.030; the City can summarily abate it and bill the owner via the Council's fee schedule.

This is not one of those rules that cities tend to ignore. Portland actively enforces its tree-of-heaven removal requirements.

Prohibited Species

Portland property owners must eradicate every species on the City's Nuisance Plants List, roots, shoots, and seeds included, under the outdoor maintenance requirements of City Code Chapter 29.20.

Key details: Governing chapter: PCC Chapter 29.20, Outdoor Maintenance. What's required: Full eradication: roots, shoots, and seeds. Applies to: All improved and unimproved property. Enforcement: City abatement plus civil penalty lien. List authority: City Administrator's Nuisance Plants List.

Portland Permitting & Development can inspect, issue a notice of violation, and if the owner doesn't comply, the City abates the nuisance itself and bills costs plus civil penalties as a lien against the property (PCC § 29.60, § 29.70.020).

This is one of the stricter rules in Portland's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Portland is tougher than many cities when it comes to invasive plant rules. Out of the 2 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in Portland, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

This guide is based on Portland's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.