18.168.150: LANDSCAPING; SCREENING MATERIALS:
Where landscaped screening is required, such screening shall consist of evergreen shrubs, closely spaced, and maintained at substantially the specified height of the required screening. When not otherwise specified, screening shall consist of mature shrubs, and shall be maintained at a height of from four (4) to six feet (6'). (Ord. 1000 § 43.35, 1955)