The University of Arizona’s beloved and iconic Old Main encapsulates the larger campus history of landscape evolution and innovation. Since the campus grounds have been used as a living laboratory, over time plant selection, design preferences, and landscape management practices have evolved increasingly toward a model of sustainability for urban deserts. As part of the 20th anniversary of Campus Arboretum service to the university, we invite you to learn about old and new ideas and envision the resilience possible in the next 20 years!