No person, firm, or corporation shall attach or place any rope, wire, sign, poster or handbill, or other thing on any tree, palm, shrub or plant now or hereafter growing in any public right-of-way in the City, or on any guard or protection of same, without first having obtained a written permit from the Department of Public Works, which permit shall clearly indicate that no harm is being done to such vegetation by such devices; nor shall any person, firm, or corporation deposit or throw upon any street or public highway, or into any gutter thereof, any brine water, oil, or any substance detrimental to the growth of any tree, palm, shrub or plant, or deposit in such gutter any receptacle containing such substance. (Ord. 1205 § 2, 1969; prior code § 27.811).