This mock orange or Philadelphus has beautiful white flowers that are wonderfully fragrant. Photo courtesy Graycliff by Connie Oswald Stofko Choosing native plants for our gardens seems like a recent trend, but native plants were used in landscaping about a hundred years ago. Ellen Biddle Shipman, the pioneering landscape architect who worked on the gardens at historic Graycliff from 1929 to 1931, chose native plants for the picking garden. The plants she used were native somewhere in North or South America,…