The use of decorative rocks, boulders, gravel, redwood bark, and other similar material for ground cover in landscaped areas shall not exceed 10% of the required landscaping. Moreover, such materials shall not be installed in the parkway or front yard setback areas of the property, except that large boulders may be installed in the front yard setback areas, provided further that the boulders do not impair sight visibility of traffic flow in the area.
('64 Code, § 56.11) (Am. Ord. 700, passed 9-11-86) Penalty, see § 10.97