Onion
The onion (*Allium cepa*) is a cultivated plant grown mainly for its edible bulb, which is widely used as a flavouring vegetable.
The onion (Allium cepa) is a cultivated plant grown mainly for its edible bulb, which is widely used as a flavouring vegetable. It is a biennial plant in the amaryllis family that is usually grown as an annual and is cultivated around the world, especially in temperate regions. Onions are a common cool-season vegetable grown in Canadian gardens and agriculture, and they are widely used in Canadian cooking.
Description
The onion is a bulb-forming plant with hollow leaves and a short stem at the base of the bulb. Its edible bulb is made of concentric fleshy leaf bases and is valued for its pungent flavour.
Cultivation and distribution
Onions have been cultivated for thousands of years and are grown globally today. Sources identify southwestern or central Asia and Persia as likely origins, with later spread into many regions and large-scale production in countries such as China, India, and the United States.
Uses
The bulb is the most commonly eaten part, but the stems and leaves are also edible. Onions are used raw, cooked, dried, dehydrated, boiled, or pickled, and they are a major flavouring ingredient in many cuisines.
Varieties and forms
Onions include different colour and size types, such as white, red, yellow, Spanish, and Bermuda onions. Some related forms, such as scallions or bunching onions, are grown for their leaves rather than enlarged bulbs.
Key facts
- The onion is one of the most widely cultivated species in the genus Allium.
- It is grown primarily for its edible bulb, which is commonly eaten cooked but can also be eaten fresh.
- Onions are usually grown as annual crops even though the plant is naturally biennial.
- The plant is likely native to southwestern Asia and is now grown worldwide.
- Onions are used in cooking in many forms, including soups, stews, salads, roasting, pickling, and frying.
Onions are a common cool-season vegetable grown in Canadian gardens and agriculture, and they are widely used in Canadian cooking.
Frequently asked questions
What is the scientific name of the onion?
What family does the onion belong to?
Which part of the onion is eaten?
Where did onions originate?
Are onions annual or biennial plants?
How are onions used in food?
References
- Wikipedia — https://www.wikiwand.com/en/articles/OnionSupports: Scientific name, genus, and status as a widely cultivated Allium species.
- Encyclopaedia Britannica — https://www.britannica.com/plant/onion-plantSupports: Description, family, likely native range, cultivation, and culinary uses.
- Penn State PlantVillage — https://plantvillage.psu.edu/topics/onion/infosSupports: Edible bulb, leaves and stems, and common uses.
- Britannica Kids — https://kids.britannica.com/students/article/onion/276190Supports: Plant description, edible bulb, origin, and production regions.
- New Mexico State University — https://onion.nmsu.edu/resources/facts.htmlSupports: Origin area, cultivation history, and family-related facts.
- University of California Agriculture and Natural Resources — https://ucanr.edu/sites/default/files/2010-09/52157.pdfSupports: Onions as a cool-season biennial plant usually grown as an annual.
- University of Connecticut — https://homegarden.cahnr.uconn.edu/factsheets/onions/Supports: Genus relationships, cultivation, and long history of cultivation.
- North Carolina State University — https://plants.ces.ncsu.edu/plants/allium-cepa/Supports: Family placement, edible bulbs and tops, and origin notes.