The 4-County CWMA is a partnership of organizations throughout SW Washington and NW Oregon dedicated to combating invasive weeds for the benefit of native habitat.

To find out more, please click on the links at the top.

Here are some examples of events at which you might find us:

Ask a CWMA representative about invasives you might have seen, pick up some useful weed ID resources, or learn more about ways the CWMA tackles weeds in your area.

Yard, Garden, and Patio ShowCWMA event
City Repair Earth Day
Portland Home and Garden Show
Audubon Society Native Plant Sale
SHIFT to Bikes!