The subject line of the following master thesis is primarily the analysis of the effects and impacts, which tree pits have on urban trees. Seven tree pit designs on 130 urban trees have been examined and studied in the district of Limpertsberg in Luxembourg City: decorative or ornamental planting, with shrubs and perennials, herbaceous crops or grass, tree pits covered with bark mulch, gravel covering, concrete covering, or open soil. The aim of this thesis is the detection of a tree pit that allows the best possible condititon of streetside trees. Visual Recordings, soil density and water permeability tests have been conducted. In the laboratory calcium carbon content, pH value, as well as grain-size distribution of the soil samples were examined. The results show that trees in tree pits higher than street level are sheltered more from mechanical damage. Urine causes the most immanent risk and damage mostly for herbaceous crops or grass. Uncovered tree pits show the least trunk leveled damage of all examined trees. The visually assessed soil compaction comes to the conclusion that tree pits covered by bark mulch, and shrubs and perennials are the least compressed. The Penetrologger field measurement concludes that grass and herbaceous plantations, and ornamental plants lead to the least satisfying results in this study. The water permeability analysis can uncover positive findings for bark mulch cover, and decorative plants. As an overall conclusion the thesis can conclude that tree pits with ornamental plantations are aesthetically the most appealing with still providing generous health benefits to the trees. Taken as a whole tree pits covered with shrubs and perennials or with decorative or ornamental planting show the best results, this is followed by tree pits covered by concrete or grids. Tree pits covered with bark mulch or gravel are only moderately recommendable. Tree pits with no covering or planting at all only do well if combined with tree guards.