Ajwain, ajowan or Trachyspermum ammi also known as ajowan caraway and bishop's weed or carom. It is an annual herb in the family Apiaceae. Both the leaves and the seed like fruit (often called seeds) of the plant are consumed by humans. The name â??Bishopâ??s weedâ?? is also is a common name for other plants. Ajwain is one of the spices that are considered useful for our health. This is normal spice used in nourishment things as in numerous Indian cooking styles and numerous more outsider dishes.