Integrated Weed Maintenance Calendar

We are very excited to present the updated 2020 Integrated Weed Maintenance Calendar!

This calendar was originally written by Metro for managing natural areas, but our Technical & Scientific Review Committee has updated it for a wider audience of land managers. Its intent is to provide the best treatment and timing options to control invasive plants that thrive in the Portland metropolitan area.

Our Technical & Scientific Review Committee will edit the calendar annually, as needed. If you have any suggestions for the calendar, please contact our Vice-Chair, Mitch Bixby (

Download it here! 2020 Integrated Weed Maintenance Calendar