Allium cepa (Onion)
Plants for a Future: description, botanic details, cultivation, uses, range.
Allium cepa proliferum (Tree Onion)
Plants for a Future: description, botanic details, cultivation, uses, range.
Commercial Green Onion Production
Guide for producing commercial green onions, University of Georgia.
Gernot Katzer's Spice Dictionary: Onions
Onion's main constituents, origin, ethymology, and how it is used for cooking around the world.
History and Origin of the Onion
A tour of the history of onions in different cultures from ancient Egypt to modern times.
Onion and Garlic Research at the University of Liv
Research into flavor of Alliums using biochemical and molecular genetic methods, led by Dr. Hamish A. Collin and Dr. Meriel G. Jones.
Onion and Its Relatives
Articles about cultivated onions from Purdue University.
Onion Production Guide
A very complete guide for onion production. University of Georgia.
Onions and Related Species
Cultivating onions: fertility, planting, pest control, storage, varieties.