When and how do I grow an onion seed (pyaaz beej) crop?

Onion seed is produced by the bulb to seed method, which is a two stage crop. First grow good bulbs in the normal rabi season, then select healthy true to type medium bulbs of your variety, cure and store them, and replant these selected mother bulbs in October to November. The replanted bulbs send up flower stalks (umbels) that flower and set seed, which matures by around March to April. Isolation from other onion varieties is essential to keep the seed pure, since onions cross pollinate by insects. Bee activity helps pollination and seed set. Harvest umbels as they turn and dry, then thresh and clean. Onion seed loses viability fast, so store it cool and dry. Confirm the recommended method and variety with your KVK or a seed agency.