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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 topsetting onions, walking onions, or Egyptian onions. Genomic evidence has conclusively shown that they are a diploid hybrid of the shallot and the Welsh onion (A. fistulosum).[2][3][4] However, some sources may still 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[5] 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.[6]
Also known as turfed stone leek, it may be cultivated commercially and for foliage.[7][8] It is described as a shallot which can be grown in tropical conditions.[9]
Many tree onions are very strong flavoured, although some cultivars are relatively mild and sweet.[5] The underground bulbs are particularly tough-skinned and pungent,[10] and can be quite elongate, like leeks,[10] or in some types may form bulbs up to 5 cm across.[5] 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.[10]
The plant is known as wakegi (ワケギ) "split scallion" in Japan. Considered a specialty of the Hiroshima Prefecture, it is used in local cooking similar to other scallions.[11]
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), 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).
Pa-kimchi (scallion kimchi)
Egyptian onions
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Tree onion
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Growing in a garden
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 topsetting onions, walking onions, or Egyptian onions. Genomic evidence has conclusively shown that they are a diploid hybrid of the shallot and the Welsh onion (A. fistulosum). However, some sources may still 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.
Allium ×proliferum estas staŭda, unukotiledona planto. Ĝi apartenas al la familio amarilidacoj. Ĝi estas hibrido de Allium cepa kaj de Allium fistulosum.
Oni povas manĝi la bulbilojn kaj la foliojn kiel kondimentojn aŭ legumojn.
Allium ×proliferum estas staŭda, unukotiledona planto. Ĝi apartenas al la familio amarilidacoj. Ĝi estas hibrido de Allium cepa kaj de Allium fistulosum.
Hjálmlaukur (fræðiheiti: Allium ×proliferum) er svipaður venjulegum matlauk en í stað blóma vaxa litlir æxlilaukar efst á stilknum. Erfðarannsóknir hafa sýnt fram á að hjálmlaukur er blendingur matlauks (A. cepa) og pípulauks (A. fistulosum).[1] Hægt er að borða bæði sjálfan laukinn, blöðin og æxlilaukana. Laukurinn er oftast frá 0,5 til 3 sentimetrar að stærð.
Á enski kallast hjálmlaukurinn einnig gangandi laukur, vegna þess að stilkarnir svigna oft undan þunga lauksinns og síga þá niður á jörð og festa þar rætur, á þann hátt dreifir hann sér oft. Einnig hefur hann verið nefndur egypski laukurinn, og ein saga þess nafns segir að hann hafi verið fluttur til Evrópu af Rómafólki.[2]
Það að mynda lauka í stað blóma efst á stilkum, má sjá hjá fleiri tegundum lauka eins og hvítlauk (A. sativum).
Breiða af hjálmlaukum
Hjálmlaukur, liggjandi, sýnir vel vaxtarlag hanns.
Villtir hjálmlaukar meðfram girðingu.
Hjálmlaukur (fræðiheiti: Allium ×proliferum) er svipaður venjulegum matlauk en í stað blóma vaxa litlir æxlilaukar efst á stilknum. Erfðarannsóknir hafa sýnt fram á að hjálmlaukur er blendingur matlauks (A. cepa) og pípulauks (A. fistulosum). Hægt er að borða bæði sjálfan laukinn, blöðin og æxlilaukana. Laukurinn er oftast frá 0,5 til 3 sentimetrar að stærð.
Á enski kallast hjálmlaukurinn einnig gangandi laukur, vegna þess að stilkarnir svigna oft undan þunga lauksinns og síga þá niður á jörð og festa þar rætur, á þann hátt dreifir hann sér oft. Einnig hefur hann verið nefndur egypski laukurinn, og ein saga þess nafns segir að hann hafi verið fluttur til Evrópu af Rómafólki.
Það að mynda lauka í stað blóma efst á stilkum, má sjá hjá fleiri tegundum lauka eins og hvítlauk (A. sativum).
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