Invasive plants don’t see our property lines. The five partners that make up Marin County’s One Tam partnership know this, and they teamed up to create an Early Detection Rapid Response (EDRR) program tasked with identifying and managing weeds spanning the jurisdictions on Mt. Tamalpais. The EDRR team released this full report on its work from the first survey cycle, offering deep analysis of survey efforts and offering detailed strategies for addressing the mountain’s most formidable weeds. The early detection work is a cornerstone to One Tam’s efforts to protect the mountain’s iconic landscapes, and the plants and animals that call them home.