This document summarizes insights from the CARES field campaign in Northern California investigating biogenic secondary organic aerosol (SOA) formation and its role in new particle growth. A variety of instruments were used to characterize the size, composition, and volatility of submicron particulate matter. Organic species dominated the PM1 composition and nucleation events producing new particles were observed daily. Positive matrix factorization of high resolution mass spectra identified three organic aerosol components: less oxidized and more oxidized oxygenated organic aerosol influenced by urban emissions and biogenic precursors respectively, as well as hydrocarbon-like organic aerosol from local combustion sources. Unique case studies will further examine biogenic SOA production and the role