by Claire Finn

I am a Centennial Volunteer Ambassador at Yosemite National Park.

Did you know that invasive species are the second largest threat to biodiversity worldwide? This past Saturday I led a volunteer group working to eradicate one of Yosemite’s most invasive species: bull thistle. Bull thistle is tall, thorny, and grows like, well, a weed. It was a hot, hot day in Yosemite Valley, but the 23 person group (a mix of corporate volunteers and families) worked hard and got a lot done to protect biodiversity in the park.

*Photo credits to wonderful volunteer Marilyn!

Teaching volunteers how to shear the bull thistle tap root - proper tool use is important!
Teaching volunteers how to shear the bull thistle tap root – proper tool use is important!
Volunteers hard at work in Cook's Meadow
Volunteers hard at work in Cook’s Meadow