Nigella sativa is an annual flowering plant, native to south and southwest Asia. It grows to 20–30 cm (7.9–12 in) tall, with finely divided, linear (but not thread-like) leaves. The flowers are delicate, and usually coloured pale blue and white, with five to ten petals. The fruit is a large and inflated capsule composed of three to seven united follicles, each containing numerous seeds. The seed is used as a spice.
Nigella sativa has a pungent bitter taste and smell. It is used primarily in confectionery and liquors. Peshawari naan is, as a rule, topped with kalonji seeds. Nigella is also used in Armenian string cheese, a braided string cheese called Majdouleh or Majdouli in the Middle East.
In the Unani Tibb system of medicine, black cumin is regarded as a valuable remedy for a number of diseases.