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'''Tree onions''' are a strong-growing [[onion]] with a bunch of bulblets where a normal onion would have flowers. Their species name is "proliferum", although they have many characteristics of the ''[[Allium cepa]]'', and are also commonly called '''Top Onions''', '''Topset Onions''', '''Walking Onions''', or '''Egyptian onions'''. ''Tree Onion'' bulblets will sprout and grow while still on the original stalk, which may bend down under the weight of the new growth, giving rise to the name, '''walking onion'''. Recent research has shown that the tree onion may be a cross between ''Allium cepa'', the cultivated [[onion]], and ''Allium fistulosum'', the [[Welsh onion]] (Some sites may currently treat the Tree Onion as ''Allium cepa'' Proliferum Group). This phenomenon of forming bulblets instead of flowers is also seen in [[garlic]] and other various wild species of ''[[Allium]]''. Bulblets in tree onions are generally very small, usually within .5 cm to 3 cm in diameter, although sizes may differ out of this range, from time to time. A similar relative to the tree onion is the [[pearl onion]] and a few other, nameable varieties. ==Cultivation== ===Propagation=== ===Pests and diseases=== ==Varieties== ==Gallery== <gallery perrow=5> Image:Allium cepa2.jpg|Egyptian onions Image:Sint Jansui (Allium fistulosum var. bulbifera).jpg|Tree onion 9 april 2007 Image:Egyptian Tree Onion, Walking Onion, Topset Onion (Allium cepa var. proliferum).jpg|Growing wild along a fence Image:Upload.png| photo 2 Image:Upload.png| photo 3 </gallery> ==References== <references/> *[[Standard Cyclopedia of Horticulture]], by L. H. Bailey, MacMillan Co., 1963 <!--- xxxxx *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381 --> <!--- xxxxx *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432 --> <!--- xxxxx *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608 --> ==External links== *{{wplink}} {{stub}} __NOTOC__
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