N. sativa is an annual flowering plant which grows up to a height of 20-90 cm with grow proliferation, flowering, seeding and death in one single season of spring and early summer. They have finely separated leaves, with diverse colours of flowers in white, yellow, pink, pale blue or pale purple, with 7-10 petals. The fruit is a large and inflated capsule composed of 4-8 united follicles each containing large amounts of seeds.