Trees and urban greenery are quietly transforming many Australian cities. A growing understanding of their benefits is fuelling a groundswell of positive change. Urban greenery is becoming a critical tool in urban, environmental and natural resource planning. Strategically planted trees and other greenery can combat heat islands, improve social inclusion, increase sense of place, enhance property values and more. This paper reviews discoveries and innovations from the study and use of urban trees and other greenery. It documents key lessons from national and international experience over the past 15 years. It goes on to outline some future trends, directions and applications for urban trees and greenery. Topics of discussion include species selection, passively enhancing childhood health and improving older people’s comfort and social experience.