We are offering onion seeds. Onion seeds (black-cumin, also known as nigella or kalonji) is an annual flowering plant in the family ranunculaceae, native to south and southwest asia. nigella sativa grows to 20–30 cm (7.9–11.8 in) tall, with finely divided, linear leaves. features: bulb size: 40-50g, 60-70, 70-80 & 90 – 100g maximum single centers medium pungency double skin good for export.