Invasive plants are the single largest threat to Yosemite’s beautiful native wildflowers. Invasive species use up valuable resources and can eventually replace native plant populations, throwing entire ecosystems out of balance.

By disrupting ecosystems, invasive plants can displace wildlife that are dependent on native plants for food and shelter. Every year brings new invaders, with more than 200 currently identified — 33 in the past three years alone.

Efforts in 2013 included expanding the park’s survey area with the help of volunteers and technology. A smartphone app was developed that allows professional and volunteer surveyors to collect information about invasive plants.

Using the survey data, scientists can quickly identify and eliminate invasive plants. Podcasts and videos were developed to teach visitors about the negative impact of bringing outside firewood (and invasive weeds) into the park.

Working together, we can protect Yosemite’s beautiful native wildflowers.

Partnering with Yosemite National Park.

Garrett Dickman


Project Notes

Himalayan blackberry has displaced more than 100 acres of native vegetation in meadow and riparian areas with high plant and animal diversity. Yellow star thistle has displaced many native plants, reduced the food supply for wild animals  â€” the sharp spines stop hikers from even walking through it.