In many towns around the world there are dense concentrations of pavements, sidewalks, buildings and other surfaces paved with asphalt that absorbs and retains heat.
Most of the available soil in the urban environment is buried under asphalt and concrete and any minimally available bare soil is compacted by foot traffic. That's why the green areas in the photos are fenced.
Adding shrub and trees to the urban environment offers ecological value and reminds us regionally typical vegetation.