Black Seeds (kalonji) , which is also called Nigella, refers to small black seeds grown on Nigella bushes, which are grown widely throughout India. Nigella is a flavouring and adds to a variety of traditional foods. Nigella Sativa is an herbal remedy that has been touted as the magic bullet for a variety of ailments. Nigella reduces joint pains, controls blood pressure, and keeps a check on diabetes.