Kalonji is an herb. Kalonji is small black Seeds, Black seeds jise Urdu and Normal Hindi me Kalonji kaha jata hai, this is a wonderful herb. Yeah chmatkarik jadi boti hai, Kalonji ka scientific name.t is important “Black cumin (kalajira) bhi Kalonji ki tarha dikhai deta he but black cumin different from Negilla Sativa (Kalonji). Kaljira and kalonji me farq hota he. Benefits of KALONJI (black seeds): 1  Intestinal worms (pait ke kide):- Intestinal worms yani pet ke kide Kalonji khane se khtam ho jate he.