Trees are living
They have requirements that must be met to enable them to keep on living. For this reason care must be taken in choosing a tree species appropriate for the planting spot, planting it correctly, and providing effective follow-up tree care. The need for care is present throughout the life of the tree, although the types of care may change.
Like other living things, trees do not last forever. In a forest, over-mature trees die, fall to the ground, and begin to sustain other trees and vegetation through the rotting process. However, for safety's sake, trees in a city setting should be removed before they reach that point.
Coeur d'Alene's Urban Forestry program has a list of trees recommended for street side planting, information about selecting trees according to purpose and site, and guidelines for correctly planting and caring for trees. In addition, Coeur d'Alene has a licensing process for tree care services which can be hired to work on public trees. Permits are required for planting, pruning or removing public trees (including those within the rights-of-way).