How does picking onions stop them going off?

Picking onions at the right time helps prevent spoilage by ensuring they are harvested while they are still healthy and robust. Onions that are left in the ground too long can become overripe, leading to decay or disease. Once harvested, proper curing and storage in a cool, dry, and well-ventilated environment further extend their shelf life by reducing moisture and preventing rot. This careful handling maintains their quality and prevents them from going off.