Calendula officinalis, the pot marigold, common marigold or Scotch marigold, is a flowering plant in the daisy family Asteraceae. It is probably native to southern Europe, though its long history of cultivation makes its precise origin unknown, and it may possibly be of garden origin.
You can use these for decorative purposes on top the soaps as well as inside your soaps. You can use them whole or grind them up. This gives a lot of interest to a bar of soap. These can be used in melt and pour as well.