The onion , which is also known as the bulb onion, common onion is the most widely cultivated species of the genus ''Allium.'' The genus ''Allium'' also contains a number of other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion , Egyptian onion , and Canada onion . The name "wild onion" is applied to a number of ''Allium'' species. Onion is most frequently a biennial, although it can also be a triennial or a perennial.
The vast majority.. more