Non-native and noxious weeds are threatening the beauty and biodiversity of Summit County. Two of the most aggressive invaders — chamomile and musk thistle — are spreading rapidly across our landscapes. Chamomile, an annual, can produce up to one million seeds per year. These seeds can lie dormant for up to 15 years. Musk thistle, a biennial, produces up to 1,000 seeds per flower head, with plants bearing up to 60 heads. These seeds can persist in the soil for a decade. Do the math — this is a crisis. 

These weeds crowd out native vegetation, which provides food for wildlife and contributes to the natural beauty we all cherish. Fortunately, both species can be controlled without chemicals. Summit County’s noxious weed program, led by licensed professionals trained in best practices, is making a difference. 

One standout initiative is the annual Weed Pull, organized by County Weed Manager Ryan Cook. This event draws over 100 volunteers for a kickoff educational session before heading out to designated sites. The effort is not about spraying chemicals — it’s about learning and eliminating with a hands-on approach. 

I applaud the communities that have embraced this mission, including the Town of Silverthorne. But we need more education, volunteers, and commitment. Whether you’re a full-time resident, second-home owner or visitor, your involvement matters. 

As someone who’s spent over 25 years in eradication efforts — including serving as chair of the State of Colorado Noxious Weed Board — I’ve seen firsthand that progress is possible as evidenced by our collective efforts in Summit County. 

Want to help? Join the annual Weed Pull next year. Learn from experts, meet your neighbors, and make a visible impact. Visit the Summit County’s website or contact Ryan Cook to get involved.