(Brian Krista/staff photo) A Karl Rosenfield Peony flower blooms at St. John Peony Farm in Havre de Grace on Wednesday. Hour-long, self-guided tours of the peony fields, for select days over ...

IT’S NOT SURPRISING that tree peonies are the national flower of China. The magnificent flowers can be as big as dinner plates. They come in a wide variety of vibrant colors, and many are fragrant.