Calendula Officinalis, or more commonly know as Pot Marigold, is a forb/herb (a forb/herb is a non-woody plant that is not a grass) of the genus Calendula. Its duration is annual which means it grows for one season only. Calendula Officinalis or Pot Marigold's floral region is North America US Lower 48, specifically in the states of California, Connecticut, Massachusetts, Maine, Michigan, New Hampshire, New York, Ohio, Pennsylvania, Washington and Wisconsin.