The Sesquicentennial was a time to explore the history of the Arboretum. In a special lecture presented on March 29, 2022— the actual day of the Arboretum’s founding 150 years before— Lisa Pearson, Head of the Arboretum Library and Archives, discussed the Arboretum’s earliest benefactors, events surrounding the Arboretum’s founding, and the development of the living collections and first infrastructure on the Arboretum grounds.