About CWMAs & Invasives

Why are invasive plants a problem?

An invasive plant is one that is not native to the area, but has been introduced and is causing damage to the natural environment. Since these plants are in a new environment, free from natural predators, parasites, or competitors of their native habitats, they can have very high population sizes. These large populations can out-compete and displace native species, or can reduce wildlife food and habitat. Some species can also disrupt vital ecosystem functions. Other invasive plants cause massive amounts of economic damage to agriculture. They can harm or kill crops, clog equipment, and contaminate produce. Some invasive plants can even cause direct harm to humans or domestic animals.

Why are CWMA’s important? Aren’t invasive plants already being managed?

Yes, the agencies and organizations involved are actively managing invasive plants, but the CWMA can help coordinate those efforts. It allows us to improve effectiveness and efficiency of management activities, manage across jurisdictional boundaries, pool available resources, and prioritize issues.

How can I help?

  • Be aware of the issues and don’t plant or spread invasive species.
  • Learn to identify the major invasive plants in your area. Report invaders to the Oregon Invasive Species Hotline!
  • Check to see if a plant is invasive before planting it.
  • Do not empty aquariums or dump houseplants into the wild.
  • Be sure to clean your shoes and brush off your clothes after being in an area with invasive plants.
  • Start a control program on your land.
  • Talk to local groups, communities, or government officials about invasive plants.

Local invaders to know:

Japanese knotweed
Garlic Mustard