Trees are living organisms that are subject to attack by decay or disease-causing natural enemies as well as weather adversities and long-term climate change in the course of their life span. When they suffer from these intrusions or extensive damage by typhoons, they often express visible symptoms, which may be structural or physiological. Initiated by a group of scholars at The Education University of Hong Kong, with the involvement of student-teachers as well as teachers and students in primary and secondary schools, a project, “Life Education and Citizen Science through Tree Protection and Conservation”, was launched with the objectives of caring, respecting and acting for our nature from preserving trees and enhancing citizens’ contribution to protecting the environment. The initial project experiences revealed that students acquired knowledge and skills in tree assessment and also cultivated positive attitudes towards tree conservation, which are relevant to the balanced development of knowledge, skills, values and attitudes in this new century. Copyright © 2023 selection and editorial matter, Kerry J. Kennedy, Margarita Pavlova and John Chi-Kin Lee; individual chapters, the contributors.