The onion plant (Allium cepa), also known as the bulb onion or common onion, is the most widely cultivated species of the genus Allium. It was first officially described by Carl Linnaeus in his 1753 work Species Plantarum. … Meer weergeven

Onion types and products
Common onions are normally available in three colour varieties:
• Yellow or brown onions (called "red" in some European countries) are sweeter and are the onions of choice for everyday use in Meer weergeven

Onions are best cultivated in fertile soils that are well-drained. Sandy loams are good as they are low in sulphur, while clayey soils usually have a high sulphur content and produce pungent bulbs. Onions require a high level of nutrients in the soil. Meer weergeven

The onion has been grown and selectively bred in cultivation for at least 7,000 years. It is a biennial plant but is usually grown as an annual. Modern varieties typically grow to a height of 15 to 45 cm (6 to 18 in). The leaves are yellowish- to bluish green and grow … Meer weergeven

The history of ancestral onion species is not well documented. Ancient records of onion use spans western and eastern Asia, so the geographic origin of the onion is uncertain. … Meer weergeven

Nutrients
Most onion cultivars are about 89% water, 9% carbohydrates (including 4% sugar and 2% dietary fibre), 1% protein, and negligible fat (table). … Meer weergeven

In 2020, world production of onions and shallots (as green produce) was 4.5 million tonnes, led by the People's Republic of China with 20% of the world total, and Mali, Japan, and South Korea as secondary producers. Meer weergeven