This calendar is intended to provide land managers and weed practitioners with the best treatment and timing options when controlling invasive plants in the Portland metropolitan region. The calendar was originally written by Metro for managing natural areas, but the 4-County CWMA Technical & Scientific Review Committee has updated it for a wider audience of land managers.

View/Download 2020 Integrated Weed Maintenance Calendar

If you have any suggestions for the calendar, please contact Mitch Bixby (Mitch.Bixby@portlandoregon.gov).

Invasive Species Resources

2020 Integrated Weed Maintenance Calendar

Oregon Invasive Species Council