Landscaping and screening. All playground, parking, waste collection, loading and service areas shall be reasonably screened at all seasons of the year from the view of adjacent residential lots and streets, and that the general landscaping of the site shall be in harmony with the existing vegetation surrounding the site and the existing character of the surrounding neighborhood. Landscaping shall not interfere nor be likely to interfere if improperly maintained with lines of sight to points of access, egress, intersections and other areas critical to safety. Healthy existing trees shall be retained to the greatest extent possible. Special attention should be paid to specimen trees and to exceptionally large or significant trees, whose significance shall be determined by factors including, but not limited to, size, species, age and location. Additional screening, such as berms, thick hedges or walls, may be required for parking areas over five spaces and/or for loading areas that are located within 50 feet of any district which permits residential uses.