Hybrid onions are derived from two parent lines, which are combined by way of cross-fertilization with the goal of duplicating the best aspects of each parent into one plant.
The concept of hybrids, in general, was developed for greater production in commercial crops. Hybrid onions tend to be heavier than either parent plant's produce, and are outstanding in shape, uniformity and time of maturation.
Popular varieties of hybrid onion seeds include yellow Granex hybrid onion, which produces a large and firm, sweet, round-globe onion; Candy hybrid, which is an extra-sweet, yellow onion with a flat globe; and Cortland F1 hybrid onion, which is a yellow onion that has excellent storage capacity.