New parking lot landscaping shall consist of peripheral landscaping having a minimum width of eight feet along a minimum of 50% of the periphery of the parking lot, which shall contain vegetative screening, including trees planted in number which would equal one tree per 100 feet, but not necessarily placed 100 feet on center, shrubs, perennials, grasses, ground cover, and annuals. Vegetation planted in this landscaping zone shall be chosen to grow to a height of not less than 2 1/2 feet.