Hierochloe odorata or Anthoxanthum nitens, also known as Sweet grass, Holy grass (UK), Bison grass (Poland), Manna grass, Mary’s grass, Vanilla grass or Unity grass, is an aromatic herb native to northern Eurasia and North America. It is used in herbal medicine and in the production of distilled beverages (e.g., Żubrówka, Wisent). It owes its distinctive sweet scent to the presence of coumarin.