Stage 1 fire restrictions, enacted for unincorporated areas of western Boulder County.

Volunteer Opportunity

List A Weed Eradication Series: Event 4: Hairy Willow Herb

Project Date: Sat, August 12, 2023 9:00 am - 12:00 pm
Opportunity Type: One-Time Volunteer Opportunity
Department: Parks & Open Space
Category: Open Space, Environment, and Gardening

Pella Crossing

Program Summary:

List A weeds are considered “ecological game changers” of the non-native plant invaders! They are mandated for eradication across the entire state of Colorado, and we could use your help to keep this particular bad-actor at bay!

Hairy Willow Herb is typically found in water-logged soils and easily tolerates inundation. Infestations can clog small waterways and displace native vegetation, increasing bank erosion and degrading wildlife habitat. Hairy willow-herb spreads easily into undisturbed areas and can form monotypic stands in wetland areas. Each mature plant can produce up to 70,000 seeds, which can be wind-dispersed thanks to a tuft of long white hairs on the oblong and flattened seeds.

This is where YOU come in! Join Boulder County Weed Specialists to dig up this plant! This requires walking in and near water on uneven terrain, while carrying and using a shovel. Shovels will be provided.

Sign up today to learn more about invasive weeds, their impact on the landscape, and to help us stave off this List A Species!


Amanda Hatfield

Application Process:


Registration is required through Discover Boulder County, Parks & Open Space’s volunteer and event registration system. If you’re new to the system, you’ll need to create an account. But it’s easy and we only use your contact information to communicate about events you register for. We will never sell or give your information to a third party.