The character and appeal of the site shall be enhanced by retaining and protecting existing trees and other natural features of the site, and through the addition of new planting materials for privacy, shade, beauty of buildings and grounds and to screen objectionable features. Plant materials to be provided shall be in scale with the compositions of the buildings, the site and its various uses and surroundings. Plant materials shall be arranged to harmonize in size, shape, color, texture and winter characteristics with the buildings and development of the grounds. Plant location and spacing shall be determined by ultimate mature growth. Plant materials shall be indigenous to the area or be readily adaptable to the local climate and soil conditions. Plant materials shall not be excessively weedy in habit or growth characteristics, nor be unduly subject to noxious pests or plant diseases. Plant materials shall be included on the site plan in a planting schedule. The schedule should identify, by key, the plant common and scientific name, size, mature growth size, how the plant will be furnished and any special notes for the proper maintenance of the plantings.