The purpose of this chapter is to assume charge, custody and control of all trees and shrubbery upon the public streets and upon public property of the city and to provide rules and regulations for the planting, pruning, caring, removal and maintenance of such trees and shrubbery and for the granting of permits relative thereto; and to define tree nuisances and provide for their abatement in order to provide for the safety, preservation of health, and to promote the prosperity and improve the order, comfort and convenience of the city. (Ord. 39, 11-10-1970)