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Trees are an integral and valuable pa rt of t he urban environment. They provide a visual softening to the harsh lines of urban development and make cities livable by improving the quality of life . They also provide city dwellers with a sense of stability in an environment that is continually changing. Trees have several settings in an urban a rea. These include parks, private property and along streets and boulevards. The largest green space in most cities is the roadside and median. Th is area provides the greatest opportunity for greening cities. It is, however , poorly understood . The paper which follows uses Calgary projects to provide some insight into the history, and problems associated with street trees.