Recent studies showed that leaf functional traits may become a reliable tool for measuring physiological stress in trees, as well as exploited as useful bio-indicators for assessment of urban habitat quality. In the second part of his lecture, Srđan Stojnić (Institute of Lowland Forestry and Environment, University of Novi Sad, Serbia) explains the details of short- and long-term response mechanisms (e.g. physiological, morphological, anatomical) exploited by urban trees to acclimate to urban habitat conditions and accompanied stress factors. Additionally, he presents the implication of scientific research for suitable tree species for cultivating in urban environments.