CU Trees 2.0 is a joint production of Grateful Green Group and IdeasLab. This new version is a collection of 219 species of plants found on the campus of The Chinese University of Hong Kong. The images were selected from over 10,000 photos. There are Chinese Mandarin and English voice over to help the users understand the species described. These plants are easily found in urban parks and country parks of Hong Kong. The app is a useful reference that can help users to appreciate the biodiversity of flora in Hong Kong, understand their ecology and habits, to care about and protect them. Free of charge and without commercials, once downloaded, CU Trees can be used offline.