Invasive Plant Monitoring and Management

A United Front Against Invasive Weeds

Invasive non-native plants are the bullies of the plant world. Characterized by fast growth, high seed production and a lack of natural enemies, they rapidly spread and displace native plants and animals, including rare, threatened, and endangered species.

Mt. Tam boasts expansive tracts of grasslands, chaparral, and forests that are relatively weed free. These precious refuges are home to many species that are declining elsewhere in California, but their proximity to populated areas means that they are subject to a continuous influx of non-native invasive plants.

Weeds are stubbornly unobservant of legislative boundaries; however, managers are often forced to stop at jurisdictional lines. Systematically removing pioneer weeds is among the most efficient ways to protect Mt. Tam’s legacy landscapes, but there must also be years of follow-up to keep dormant seeds and roots from reestablishing.

Mt. Tam’s land managers’ ongoing weed control efforts have been hindered by a shortage of staff, funding, and interagency coordination. A holistic OneTam Weed Management Program will fill these needs and build on successful existing models to find and eliminate priority weeds and engage volunteers in caring for Mt. Tam.

Volunteers of all ages can help keep Mt. Tam’s fields and forests weed free

Existing invasive species early detection programs offer a successful model to build upon

Creating up-to-date inventories and maps is essential for finding and controlling Mt. Tam’s invasive weeds

A botanical strike force could tackle weeds and protect rare plants

Invasive species like the Cape ivy pictured here have completely taken over some areas of Mt. Tam

Timeline