Allium fistulosum

Allium fistulosum, the Welsh onion, also commonly called bunching onion, long green onion, Japanese bunching onion, and spring onion, is a species of perennial plant, often considered to be a kind of scallion.

Welsh onion
Allium fistulosum at a farm
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Amaryllidaceae
Subfamily: Allioideae
Genus: Allium
Subgenus: A. subg. Cepa
Species:
A. fistulosum
Binomial name
Allium fistulosum
Synonyms
Welsh onions, raw
Nutritional value per 100 g (3.5 oz)
Energy142 kJ (34 kcal)
6.5 g
Sugars2.18 g
Dietary fiber2.4 g
0.4 g
1.9 g
VitaminsQuantity
%DV
Thiamine (B1)
4%
0.05 mg
Riboflavin (B2)
8%
0.09 mg
Niacin (B3)
3%
0.4 mg
Pantothenic acid (B5)
3%
0.169 mg
Vitamin B6
6%
0.072 mg
Folate (B9)
4%
16 μg
Vitamin C
33%
27 mg
Vitamin E
3%
0.51 mg
Vitamin K
184%
193.4 μg
MineralsQuantity
%DV
Calcium
5%
52 mg
Iron
9%
1.22 mg
Magnesium
6%
23 mg
Manganese
7%
0.137 mg
Phosphorus
7%
49 mg
Potassium
7%
212 mg
Sodium
1%
17 mg
Zinc
5%
0.52 mg

Percentages are roughly approximated using US recommendations for adults.
Source: USDA FoodData Central

The species is very similar in taste and odor to the related common onion, Allium cepa, and hybrids between the two (tree onions) exist. A. fistulosum, however, does not develop bulbs, and possesses hollow leaves (fistulosum means "hollow") and scapes. Larger varieties of A. fistulosum, such as the Japanese negi, resemble the leek, whilst smaller varieties resemble chives. A. fistulosum can multiply by forming perennial evergreen clumps. It is also grown in a bunch as an ornamental plant.

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