Weed Warriors

Group of Weed Warrior Volunteers at workday in Sligo Creek Park, 2017

Non-native, invasive plants pose a serious threat to the health of our parks.  Find out more about the problem and how you can help!

What is a Non-native, Invasive Plant?

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, or canopy layers of a forest.

Non-native, invasive species (NNIs) can alter the complex webs of plant-animal associations that have evolved over thousands of years to such a degree that plants and animals once familiar to us are eliminated.  In meadows, for example, NNI monocultures can threaten butterfly populations because they can no longer find the native host plants they depend on for survival.  In forests, non-native, invasive vines can strangle and smother trees.  Non-native, invasive shrubs can displace and shade out native plants that provide birds and other wildlife with food and shelter.  Recent research has shown that NNIs can even alter soil chemistry and disrupt the growth of the mycorrhizal fungi on which healthy forests depend.  In short, non-native, invasive plants are causing significant changes in the composition, structure, and ecosystem function of our natural areas.

A typical non-native, invasive (NNI) plant has some or all of the following characteristics:

  • Grows fast and matures early.
  • Spreads quickly over large areas; thrives in many habitats.
  • Reproduces profusely by seed and/or vegetative structures.
  • Survives and produces seeds under adverse environmental conditions.
  • Has few known diseases or pests.

By their very nature, non-native, invasive plants are difficult to control. Often it requires a mix of mechanical, chemical and hand removal efforts to be successful. The key is to find NNI populations when they are small and remove them before they become established.

Non-native Invasive Plants in Montgomery County

These plants present the most serious threats to natural areas in Montgomery County, including parkland owned and managed by Montgomery Parks:

How You Can Help

The Weed Warrior Volunteer Program was created in 1999 to empower citizens to help Montgomery Parks’ staff manage Non-Native, Invasive Plants on parkland. Citizen volunteers are taught to properly identify and manage NNI’s using the best management practices of the time; with the ability to focus one’s time and attention in specific location(s) desired. To date, Weed Warrior volunteers have logged more than 98,000 hours of service and have made an incredible contribution to the control of non-native invasive plants in Montgomery County Parks!

Here are two ways you can get involved:

Become a Certified Weed Warrior Volunteer

PLEASE NOTE: If you would like to be notified when Weed Warrior trainings recommence, please email: mcp-weedwarriors@montgomeryparks.org. In the meantime, we encourage you join our Weed Warrior Group Workdays which are a great way to start learning invasive plants and contribute to the health of our parks – no training required.  See below for more information.

Join a Group Weed Warrior Workday

Want to help, but not sure you’re ready to become a Certified Weed Warrior?  We offer lots of group workdays throughout the year at parks across the county — no advanced training required.  These workdays are led by specially-trained volunteer Weed Warrior Supervisors and/or Parks staff and they’re a great way to start learning how to identify and remove invasive plants!

Interested in joining in a Group Weed Warrior Workday? Please visit this webpage to see all our upcoming events.

Current Certified Weed Warriors

Please remember to log your volunteer hours and keep your contact information up-to-date.


Give a Gift of Green!
You can also help by donating. Learn how you can give or dedicate a “Gift of Green” for various commemorative purposes, to honor a person, group or occasion; memorialize a family member, friend, or colleague; celebrate a birthday, an anniversary, or other special event. Visit the Montgomery Parks Foundation to learn more.


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Last Updated: October 25, 2019