Tree onion

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Species of flowering plant

title: "Tree onion" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["allium", "interspecific-plant-hybrids", "korean-vegetables", "onions", "perennial-vegetables", "plants-described-in-1794"] description: "Species of flowering plant" topic_path: "geography/korea" source: "https://en.wikipedia.org/wiki/Tree_onion" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Species of flowering plant ::

| genus = Allium | species = × proliferum | name = Tree onion | image = Allium fistulosum bulbifera0.jpg | image_caption = Onion stalks with bulblets, or miniature onions grown at the top of the stalk | authority = (Moench) Schrad. ex Willd. | synonyms_ref = | synonyms = {{Species list |Allium cepa* var. proliferum|(Moench) Regel |Allium fistulosum var. viviparum|Makino |Allium fistulosum f. viviparum|(Makino) M.Hiroe |Allium multitabulatum|S. Cicina |Allium × wakegi|Araki |Cepa × *prolifera|Moench

The tree onion (Allium × proliferum) is a perennial plant similar to the common onion (A. cepa), but with a cluster of bulblets where a normal onion would have flowers. Tree onions are also known as Spring onions, Green onions, topsetting onions, walking onions, or Egyptian onions. Genomic evidence has suggested that they may be a diploid hybrid of the shallot and the Welsh onion (A. fistulosum). Other sources treat the tree onion as A. cepa var. proliferum or A. cepa Proliferum Group.

Tree onion bulblets will sprout and grow while still on the original stalk. The bulblets are usually marble-sized, between 0.5 cm to 3 cm in diameter. They may bend down under the weight of the new growth and take root some distance from the parent plant, giving rise to the name "walking onion". It has been postulated that the name "Egyptian onion" derived from Romani people bringing tree onions to Europe from the Indian subcontinent. The phenomenon of forming bulblets (bulbils) instead of flowers is also seen in top-setting garlic and other alliums, which sometimes may also be referred to as top onions or tree onions.

Also known as turfed stone leek, it may be cultivated commercially and for foliage. It is described as a shallot which can be grown in tropical conditions.

Many tree onions are very strong flavoured, although some cultivars are relatively mild and sweet. The underground bulbs are particularly tough-skinned and pungent, and can be quite elongate, like leeks, or in some types may form bulbs up to 5 cm across. Young plants may be used as scallions in the spring, and the bulblets may be used in cooking similarly to regular onions, or preserved by pickling.

Culinary use

Japan

The plant is known as in Japan. Considered a specialty of the Hiroshima Prefecture, it is used in local cooking similar to other scallions.

Korea

In Korea, Allium × proliferum along with A. fistulosum is called pa (파, "scallion"), while common onions are called yangpa (양파, "Western scallion"). While A. × proliferum is called jjokpa (쪽파, "separated scallion"), A. fistulosum is called either daepa (대파, "big scallion") or silpa (실파, "thread scallion") depending on the size. Unlike daepa and silpa, which are usually used as a spice, herb, or garnish, jjokpa is often used as the main ingredient of various scallion dishes in Korean cuisine. Common dishes made with jjokpa include pajeon (scallion pancakes) and pa-kimchi (scallion kimchi).

File:Haemulpajeon.jpg|Haemul-pajeon (scallion pancake with seafood) File:Scallion kimchi.jpg|Pa-kimchi (scallion kimchi)

Gallery

Image:Allium cepa2.jpg|Egyptian onions Image:Sint Jansui (Allium fistulosum var. bulbifera).jpg|Tree onion Image:Egyptian Tree Onion, Walking Onion, Topset Onion (Allium cepa var. proliferum).jpg|Growing in a garden

References

References

  1. "Allium × proliferum (Moench) Schrad. ex Willd.".
  2. Friesen, N. & M. Klaas. (1998). "Origin of some vegetatively propagated ''Allium'' crops studied with RAPD and GISH.". Genetic Resources and Crop Evolution.
  3. (2001). "RFLP Analysis of Mitochondrial DNA in Wakegi Onion.". Engei Gakkai Zasshi.
  4. James L. Brewster. (1 January 2008). "Onions and Other Vegetable Alliums". CABI.
  5. Ruttle, Jack. "Confessions of an Onion Addict". National Gardening Association.
  6. "Allium | Piedmont Master Gardeners".
  7. (2002). "Allium Crop Science: Recent Advances". CABI.
  8. (6 December 2012). "World Vegetables: Principles, Production, and Nutritive Values". Springer Science & Business Media.
  9. (6 December 2007). "Vegetables II: Fabaceae, Liliaceae, Solanaceae, and Umbelliferae". Springer Science & Business Media.
  10. Chandoha, Walter. "Egyptian Onions are the Easiest". Cornell University Cooperative Extension.
  11. "わけぎの需給動向". 独立行政法人農畜産業振興機構.

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alliuminterspecific-plant-hybridskorean-vegetablesonionsperennial-vegetablesplants-described-in-1794