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Most natural communities support a great variety of native plants and animals. Such biodiversity is threatened when a few plant species take over and dominate the herbaceous, shrub, and canopy layers of a forest.

This Week in the Woods

Weed Warriors are out in the parks every day. Here we share some of our latest finds.

Find out more about the problem with invasive plants and how you can help in our Learning Center.

Meet the Weed Warriors

Warrior-in-Chief Carole

Carole Bergmann is the woman who dreamed up this whole project over 15 years ago. As a young natural resource manager she was at the forefront of noticing the effects non-native invasives were having on the forest ecosystem. Trees were falling, birds were leaving and the parks were not the same. Working with Friends groups and volunteers, Carole laid the foundation for one of the most outstanding (I'm not just saying that) non-native invasive species control programs in the country. Now, as Forest Ecologist for Montgomery Parks, Carole leads the Weed Warriors in the effort to manually control non-native invasive plants. Check out the updated and revised Best Management Practices methodology handbook.

Event Highlights

Find more Weed Warrior events listed on our Weed Warrior Event Page and the Park Events Calendar.

First Saturday Workdays

Saturday, June 6, 10:00-12:00PM
We'll take a look at the Purdum Trail of Little Bennett Park. We could encounter Japanese barberry, straggler garlic mustards or who knows what. There will be plenty of natives mixed in to be able to practice seeing what is supposed to be all over Montgomery County! You do not have to be a certified weed warrior to volunteer. RSVP by June 3 to Meghan at

Sunday, June 28, 9:00-11:00AM
The fist Saturday in July is a holiday (happy birthday, USA), so let's meet a little earlier and tackle some porcelainberry (and/or other vines) in Rock Creek Park. There will be plenty of work, so bring your friends (4 legged as well). RSVP by June 25 to Meghan at

Supervisor-led Events

Be sure to check out the Park Events Calendar to see a current listing of all Weed Warrior events.

Saturdays, May 30 10:00-12:00PM
Join the neighbors of Locust Hill to uncover the hidden gem of Elmhirst Parkway Park a tributary to Rock Creek Stream Valley. RSVP to Anne at to get details.

Last Saturday of the month, May 30 9:00-11:00AM, June 27 8:00-10:00AM
Preserve the legacy of Sligo Creek. Find out more and RSVP to Greg at

Second to Last Saturday of the month, May 23 9:00-12:00PM
Explore the insiders guide to Watts or Muddy Branch. Learn meeting location and more with an RSVP to Ken at

Fourth Saturday of the month, May 23, June 27 10:00-12:00PM
The Rachel Carson Greenway Trail and Northwest Branch Trails are some of the wildest trails. Meet at the Burnt Mills Dam. Learn meeting location and more with an RSVP to Larry at

Sundays, through May 17, 1:00-3:00PM
Sunday afternoons are the perfect day to protect the trees. Find out more about the efforts at Little Falls and RSVP to Celia at

Volunteer Basics

Weed Warrior training icon Becoming a Certified Weed Warrior is easy!
We offer trainings from April to October, usually the fourth Wednesday of the month. Registration is now open for trainings through July, please register here.

Special Projects

Are you interested in joining in a Special Project Weed Warrior project for a day? Click here to search the Park Events Calendar for volunteer opportunities. Click here to search the current individual Volunteer Services Office listings.

  • No experience is necessary. We will train you on-site
  • The minimum age for most projects is 14
  • Participants under the age of 16 must be accompanied by an adult
  • We are Student Service Learning (SSL) approved
  • Wear clothes that are good for working in the out-of-doors
  • Bring gloves, pruners, and water - we will have extras on-site if you don't have them
  • We work rain or shine, however, thunderstorms do cancel the project

Existing Weed Warriors report your hours here.

Weed warrior video imageWeed Warriors on County Cable Montgomery

Some our favorite Weed Warriors did a video interview for "Did You Know?", a local cable show for County Cable Montgomery. If you ever wanted to know what we do, and why, watching this will get you up to speed.

Thank You!

Thank you to all of our volunteers!

garlic mustardEach spring, garlic mustard (Alliaria petiolata) carpets parkland. This non-native invasive will outcompete native spring wildflowers if left unmanaged. Join the hundreds of volunteers that contribute to removing thousands of pounds of garlic mustard every year. There is an event every weekend between now and mid-May, come see us in the parks.

Thanks so much to our regular Weed Warriors and our Warrior for a Day recruits!




Contact Us

Please email our Volunteer Coordinator for more information and to register for training at:

back to top - Last update: May 5, 2015