For a corner lot, existing hedges, shrubs or any other plant material within 30 feet of the street intersection shall be trimmed and maintained so as not to stand more than 26 inches above the level of the sidewalk. On corners where existing embankments, retaining walls or other objects are placed, no plant materials shall be planted unless by permit from the director of parks and open space. (Code 1979, § 29-38; Ord. No. 95-53, exhibit A (§ 29-38), 9-11-1995)