Landscaping plan, including site grading, landscaping design, types of plantings and height. Said landscaping plan shall provide for a buffer zone on each property line not abutting a street, planted with at least a double row of conifer trees, at least four feet high on six-foot centers; provided, however, that the Town Board may require additional plantings and/or fencing. Plantings shall be properly bedded when planted, maintained and fertilized to assure long life and growth. All trees, fencing and plantings, together with green areas, shall thereafter be continually maintained by the record owner(s) of the premises. Dead plantings shall be replaced.