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Allium fistulosum - L.

Common Name Welsh Onion
Family Alliaceae
USDA hardiness 5-9
Known Hazards Although no individual reports regarding this species have been seen, there have been cases of poisoning caused by the consumption, in large quantities and by some mammals, of certain members of this genus. Dogs seem to be particularly susceptible[76].
Habitats Cultivated for over 1000 years, it is not known in the wild.
Range E. Asia, possibly western China, though the original habitat is obscure.
Edibility Rating    (5 of 5)
Other Uses    (2 of 5)
Weed Potential No
Medicinal Rating    (2 of 5)
Care (info)
Fully Hardy Moist Soil Full sun
Allium fistulosum Welsh Onion


(c) 2010 Ken Fern, Plants For A Future
Allium fistulosum Welsh Onion

 

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Summary


Physical Characteristics

 icon of manicon of bulb
Allium fistulosum is a BULB growing to 0.6 m (2ft) by 0.2 m (0ft 8in).
See above for USDA hardiness. It is hardy to UK zone 6 and is not frost tender. It is in flower in July. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, insects.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map

Synonyms

Plant Habitats

 Cultivated Beds;

Edible Uses

Edible Parts: Flowers  Leaves  Root
Edible Uses:

Bulb - raw or cooked[2]. A strong onion flavour, it can be used in salads, as a cooked vegetable or as a flavouring in cooked foods[22, K]. The bulbs are rather small, usually 10 - 25mm in diameter though they can be up to 45mm[266], and are sometimes used as spring onions[183]. A nutritional analysis is available[218]. Leaves - raw or cooked[2]. They have a mild onion flavour[183] and can be added to salads or cooked as a vegetable[116]. The leaves are often available all through the winter if the weather is not too severe[K]. They contain about 1.4% protein, 0.3% fat, 4.6% carbohydrate, 0.8% ash, some vitamin B1 and moderate levels of vitamin C[179]. Flowers - raw. A pleasant onion flavour, but they are rather on the dry side[K].

References   More on Edible Uses

Composition
Figures in grams (g) or miligrams (mg) per 100g of food.
Leaves (Fresh weight)
  • 0 Calories per 100g
  • Water : 0%
  • Protein: 1.4g; Fat: 0.3g; Carbohydrate: 4.6g; Fibre: 0g; Ash: 0.8g;
  • Minerals - Calcium: 0mg; Phosphorus: 0mg; Iron: 0mg; Magnesium: 0mg; Sodium: 0mg; Potassium: 0mg; Zinc: 0mg;
  • Vitamins - A: 0mg; Thiamine (B1): 0mg; Riboflavin (B2): 0mg; Niacin: 0mg; B6: 0mg; C: 0mg;
  • Reference: [ ]
  • Notes:

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Antibacterial  Antifungal  Antipyretic  Diuretic  Expectorant  Stomachic  Vitamin C

The bulb contains an essential oil that is rich in sulphur compounds[283]. It is antibacterial, antiseptic, diaphoretic, diuretic, galactogogue, stomachic, vermifuge and vulnerary[176, 218]. It is used in the treatment of colds and abdominal coldness and fullness[176]. A tea made from the roots is a children's sedative[218]. Use of the bulb in the diet impedes internal parasites[218]. Externally, the bulb can be made into a poultice to drain pus from sores, boils and abscesses[254].

References   More on Medicinal Uses

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Other Uses

Repellent

The juice of the plant is used as a moth repellent. The whole plant is said to repel insects and moles[20].

Special Uses

Food Forest

References   More on Other Uses

Cultivation details

An easily grown plant[203], it prefers a sunny position in a light well-drained soil[1] but tolerates most soils[1, 52] including those that are damp and acid[203]. Prefers a pH in the range 6.5 to 7.5[206], but it tolerates a pH in the range 4.9 to 7.5. A very hardy species, it is related to the cultivated onion (A. cepa) and could be of value in breeding programmes. It is sometimes cultivated in the garden for its edible leaves which can be produced throughout the winter if the weather is not too severe[K]. A very popular cultivated vegetable in the Orient[206], it probably arose through cultivation from A. altaicum[203]. The oriental forms of this species, known as bunching onions, tend to be hardier and more robust than the welsh onion[206]. There are two basic forms, multi-stem types and single-stem types. The single-stem types divide less freely than the multi-stems[206]. Plants will often retain their leaves even when covered in snow[206]. They are also tolerant of high temperatures and can be grown in the tropics[206]. The plants are often eaten by slugs[K]. The bulbs should be planted fairly deeply[1]. Most members of this genus are intolerant of competition from other growing plants[203]. Grows well with most plants, especially roses, carrots, beet and chamomile, but it inhibits the growth of legumes[18, 20, 54]. This plant is a bad companion for alfalfa, each species negatively affecting the other[201]. Members of this genus are rarely if ever troubled by browsing deer[233]. For polyculture design as well as the above-ground architecture (form - tree, shrub etc. and size shown above) information on the habit and root pattern is also useful and given here if available. The plant growth habit is a clumper with limited spread [1-2]. The root pattern is a bulb.

References   Carbon Farming Information and Carbon Sequestration Information

Temperature Converter

Type a value in the Celsius field to convert the value to Fahrenheit:

Fahrenheit:

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Plant Propagation

Seed - sow spring in a greenhouse. The seed germinates over a wide range of temperatures, it is faster at higher temperatures[206]. Prick out the seedlings into individual pots when they are large enough to handle. When well-grown, the plants should be ready to be planted out in the summer. If they are not large enough at this time, grow them on in the greenhouse for their first winter and plant them out in late spring. Division of the plants is very easy and can be done at almost any time of the year though the spring is probably best. The divisions can be planted out straight into their permanent positions if required.

Other Names

If available other names are mentioned here

Native Range

TEMPERATE ASIA: China South-Central,China North-Central.

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Allium acuminatumHooker's Onion, Tapertip onionBulb0.3 5-9  LMNDM322
Allium aflatunensePersian Onion, Ornamental OnionBulb1.0 4-8 MLMNM221
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Allium altaicum Bulb0.3 -  LMNM321
Allium ampeloprasumWild Leek, Broadleaf wild leekBulb1.8 5-9  LMHNDM532
Allium ampeloprasum babingtoniiBabington's LeekBulb1.8 0-0  LMHNDM332
Allium angulare Bulb0.0 -  LMNM321
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Allium bolanderiBolander's OnionBulb0.2 6-9  LMNM321
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Allium carolinianum Bulb0.4 -  LMNDM321
Allium cepaOnion, Garden onionBulb0.6 4-10  LMNM533
Allium cepa aggregatumPotato OnionBulb1.2 4-8  LMNM433
Allium cepa ascalonicumShallotBulb0.3 4-8  LMNM532
Allium cepa proliferumTree Onion, Walking OnionBulb1.2 4-8  LMNM533
Allium cernuumNodding Onion, New Mexican nodding onionBulb0.5 5-9  LMHNM522
Allium chinenseRakkyoBulb0.3 6-9  LMNM421
Allium condensatum Bulb0.6 4-8  LMNM321
Allium cupanii Bulb0.3 7-10  LMNDM321
Allium douglasiiDouglas' OnionBulb0.3 0-0  LMNDM321
Allium dregeanumWild OnionBulb0.6 -  LMNDM321
Allium drummondiiPrairie Onion, Drummond's onionBulb0.3 6-9  LMNM321
Allium flavumSmall Yellow Onion, Ornamental OnionBulb0.5 4-7 MLMHSNM221
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Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

Expert comment

Author

L.

Botanical References

266

Links / References

For a list of references used on this page please go here

Readers comment

Judith Gilliland   Mon Sep 8 2008

where can i buy seeds/plants ???

Mrs Pamela Robins   Tue Mar 31 2009

where can I but the plants/seeds please

Claire   Tue Apr 28 2009

If you are in the UK you should be able to find them on EBay (I've noticed people listing them for the last 3 months or so). Some garden centres here may have them too in the herb section (that's where I bought mine).

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