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(3) Deciduous shrubs shall be at least 24 inches in height, unless located in the side or rear yard, where they may be a minimum of 15 inches in height. (4) Evergreen shrubs shall be a minimum of 18 inches in height, unless located in the side or rear yard, where they may be a minimum of 12 inches in height. E. Fences and walls. When a development includes a fence or wall, the following guidelines and standards shall apply. This section does not apply to required retaining walls. (1) The maximum height and setback for fences and walls shall comply with the regulations set for the district in which they are located (see 225-11). (2) A rear lot line and/or an interior side lot line that abuts a residential use or district shall require additional screening. Screening may include a dense, natural hedge reaching a height of five feet within three years or by a solid fence or masonry wall at least five feet in height. (3) No fence located in a front yard shall be more than 50% opaque, unless otherwise approved by the Planning Board. (4) Walls and fences shall be constructed of high-quality materials, such as decorative blocks, brick, stone, treated wood, vinyl, hardy plank, and wrought iron. Prohibited materials include: (a) Smooth-faced gray concrete block, smooth-faced painted or stained concrete block, smooth-faced concrete panels; (b) Unfinished wood; (c) Chain link; and (d) Corrugated metal siding. (5) Breaks in the length of a fence shall be made to provide pedestrian connections to the perimeter of a site or to adjacent development. (6) The maximum length of continuous, unbroken, and uninterrupted fence or wall plane shall be 50 feet. Breaks shall be provided through the use of columns, landscaping pockets, transparent sections, and/or a change to different materials. (7) Fences and walls shall be set back from the front and side lot line to allow a landscape setback area. Such setback area shall be landscaped with a turf, shrubs, and/or trees, using a variety of species to provide seasonal color and plant variety. (8) Use of landscaping beyond the minimum required in these standards is strongly encouraged to soften the visual impact of fences and walls. F. Parking lot landscaping. (1) Parking lot medians shall be required between parking blocks (maximum 40 parking spaces). Medians shall be a minimum of 10 feet in width, and shall be planted to provide visual buffering between sections to a density and arrangement deemed appropriate by the Planning Board. (2) At least one landscaped island with a minimum width of five feet and minimum size of 160 square feet shall be provided for every 20 parking spaces. (3) Circulatory drive aisles and landscaped islands shall be installed such that no more than 20 parking spaces in a single row, or 40 in a double row, shall go uninterrupted.