It shall be unlawful for any person to cut, trim, remove, injure or interfere with any shrubbery or ornamental trees or shrubbery in parks, pleasure grounds, boulevards, alleys or streets of the City. Any person maintaining any overhead wires or conduit along or across any street or alley of the City desiring to have any trees or shrubs that may interfere with any such utility cut, trimmed or pruned may upon application to the City Forester be granted permission to cut, trim or prune such trees or shrubs, subject to the supervision of the Forester or upon written application to the Superintendent of Streets, accompanied by a written agreement to pay the cost thereof. Such cutting, trimming or pruning shall be done by the City Forester at the cost of the applicant. (Code 1962, § 35-36)