Required Removal of Some Invasive Plants
The City of Portland wants to make sure that 15 species of invasive plants don't get a chance to become established in the city. As of July 1, 2010, Portland property owners are required to remove from their property any plant species on the city's "Required Eradication List." The rule is in City Code Title 29 Property Maintenance Regulations, and applies to both private and public landowners.
The new requirement is part of Portland's Early Detection and Rapid Response effort to quickly locate and remove the most dangerous invasive plants before they spread. Invasive plants are easier to control if they are eradicated before they infest large areas. Large infestations are more expensive to control and can damage natural habitat.
Invasive plants that dominate groundcover lack root structure to bind soils, which increases the likelihood of erosion. Invasive plants grow rapidly and can displace native plants, and destroy food and shelter for native wildlife.
The city offers property owners free assistance to identify and remove plants on the Required Eradication List. Property owners can call the Early Detection and Rapid Response team at 503-823-2989 for more information.
The 15 plants on the Required Eradication List are:
- Russian knapweed
- False brome
- Italian thistle (a.k.a. slender flowered thistle)
- Jubata grass
- Paterson's curse
- Giant hogweed
- Orange hawkweed
- Meadow hawkweed (formerly yellow hawkweed)
- Policemen's helmet
- Scotch thistle
- Common reed
- Blessed milk thistle
There are currently no large infestations of these species in the Portland area. City regulations are designed to keep species on the Required Eradication List from gaining a foothold here.