The onion (Allium cepa L.) is an indispensable element of almost every culture as a vegetable. It consumed as raw or a component of meals in many different cultures around the world. Also, unlike many other vegetable species, consumption of onion is not limited to a particular season.
Academic studies on onions are quite difficult due to some features such as multiple flower structure, prolonged flowering period, long isolation distance for control of fertility, the strong effect of environmental factors on some morphological features, difficulty in maintaining genetic resources etc. In addition to these, at least two years are needed from seed sowing to seed harvesting. The onion bulbs harvested in the previous season should be stored under appropriate conditions and plantation should be established again in the second year for seed production.
An edible bulb with a pungent taste and smell, composed of several concentric layers, used in cooking. 2: A strong-smelling pungent-tasting bulb, used as a flavoring in cooking and in herbal medicine.