Most traditional European onions are what is referred to as "long-day" onions, producing bulbs only after 14+ hours of daylight occurs.
Iningi lo-anyanisi wendabuko wase-Europe kubhekiselwa kulo njengo-anyanisi "wosuku olude," okhiqiza ama-bulbs kuphela ngemuva kwamahora ayi-14 noma ngaphezulu kokukhanya kwelanga.