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Trees growing within cities and towns form a forest-an urban forest. But urban trees require special attention, because they are expected to exist within the urban environment. With its infrastructure of streets, sidewalks, curbs, buried utilities, overhead power lines and buildings, the urban environment places tremendous stresses on trees. With proper care, trees become assets which grow in value over time. Without care, tree value declines, eventually becoming a liability to the community. The Technical Guide to Urban Forestry was produced to help communities develop, manage and protect their urban forest resources. The purpose of this publication is to provide technical information about growing trees in the relatively adverse urban environment.