Portland, OR Invasive Plant Rules: Prohibited Species (2026)

G. Nuisance plants. Eradication, as defined in Subsection 29.10.020 V., is required of all plants identified on the Nuisance Plants List. The City Administrator will adopt administrative rules detailing implementation and enforcement of this provision.

H. Trash and debris. Remove, and keep removed, unless specifically authorized by ordinance to do otherwise:

1. All garbage, offal, dead animals, animal and human waste, and waste materials (All garbage must be stored as specified in Section 29.30.140);

2. Accumulations of litter, glass, scrap materials (such as wood, metal, paper, and plastics), junk, combustible materials, stagnant water, or trash;

3. All dead bushes, dead trees, and stumps with the exception of such material that:

a. Is being maintained as part of a naturescaped property;

b. Does not result in a nuisance as otherwise defined in this chapter; and

c. Is located on a property that is otherwise substantially in compliance with this Chapter;

4. All trees that are dead, dying or dangerous and are determined by the City Forester or a private certified arborist to require removal in order to safeguard people or property per the provisions in Portland City Code Title 11;

5. Accumulations of dead organic matter and yard debris, with the exception of small accumulations of such material in a maintained compost area on the property and only if such material does not result in a nuisance, such as creating rat harborage, as otherwise defined in this chapter; and