a b "FAQ". National Onion Association. Archived from the original on 18 March 2011 . Retrieved 28 March 2013. This genus also contains several other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion Allium fistulosum, the tree onion Allium× proliferum, and the Canada onion Allium canadense. The name wild onion is applied to a number of Allium species, but A. cepa is exclusively known from cultivation. Its ancestral wild original form is not known, although escapes from cultivation have become established in some regions. [5] The onion is most frequently a biennial or a perennial plant, but is usually treated as an annual and harvested in its first growing season. Van Hare, Holly (19 December 2017). "Onions that don't make you cry are finally here". Los Angeles Times. Archived from the original on 13 April 2018 . Retrieved 15 April 2018. Allium cepa var. cepa". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture . Retrieved 10 December 2017. Education The large size of onion cells makes them useful for microscopy. These cells from the epidermis of a red onion are naturally pigmented.

a b Danovich, Tove (8 February 2018). "Stop Crying! Tear-Free Onions Are Here". NPR. Archived from the original on 17 April 2018 . Retrieved 13 April 2018. A little refresher on the dark web – it’s like a gathering house, where all sorts of people congregate. Some are looking for whitepapers that would otherwise be inaccessible through the clear web (i.e. behind a very tall and expensive paywall), others for a chat with complete strangers, and yes, some would even peddle their ill-gotten booty or plotting world domination. Mower, Chris (30 March 2009). "The Difference between Yellow, White, and Red Onions". The Cooking Dish. Archived from the original on 1 May 2013 . Retrieved 24 March 2013.Hessayon, D.G. (1978). Be your own Vegetable Doctor. Pan Britannica Industries. pp.22–23. ISBN 978-0-903505-08-6. Necipoǧlu, Gülru (1989). "Süleyman the Magnificent and the Representation of Power in the Context of Ottoman-Hapsburg-Papal Rivalry". The Art Bulletin. 71 (3): 416. doi: 10.1080/00043079.1989.10788514. JSTOR 3051136.

Onions are toxic to dogs, cats, guinea pigs, and many other animals. [53] [54] Cultivation Large-scale onion cultivation Tunnels (last working) links: http://62gs2n5ydnyffzfy.onion or http://74ypjqjwf6oejmax.onion 11. Imperial LibraryThe amount of sulfenic acids and lacrimal factor released and the irritation effect differs among Allium species. In 2008, the New Zealand Institute for Crop and Food Research created "no tears" onions by genetic modification to prevent the synthesis of lachrymatory factor synthase in onions. [41] One study suggests that consumers prefer the flavour of onions with lower LFS content. [42] Since the process impedes sulfur ingestion by the plant, some find LFS− onions inferior in flavour. [43] Oulton, Randal (9 September 2005). "Bermuda Onions". cooksinfo.com. Archived from the original on 11 February 2021 . Retrieved 25 November 2017. USDA, NRCS (n.d.). " Allium cepa". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team . Retrieved 31 March 2013. The CIA (last working) link: http://ciadotgov4sjwlzihbbgxnqg3xiyrg7so2r2o3lt5wz5ypk4sxyjstad.onion/ 20. Google Feud Olsson, M.E.; Gustavsson, K.E. & Vågen, I.M. (2010). "Quercetin and isorhamnetin in sweet and red cultivars of onion ( Allium cepa L.) at harvest, after field curing, heat treatment, and storage". Journal of Agricultural and Food Chemistry. 58 (4): 2323–2330. doi: 10.1021/jf9027014. PMID 20099844.

White onions are mild in flavour; they have a golden colour when cooked and a particularly sweet flavour when sautéed. [23] [18] a b Ansari, Naser Alemzadeh (2007). "Onion Cultivation and Production in Iran" (PDF). Middle Eastern and Russian Journal of Plant Science and Biotechnology. 1 (2): 26–38. ISSN 1752-3907. Archived (PDF) from the original on 28 August 2021 . Retrieved 22 April 2022– via Global Science Books. Onion originated in Iran and its neighboring countries (Hanelt 1990). Sweet onions have a greater water and sugar content than cooking onions. This makes them sweeter and milder tasting, but reduces their shelf life. Sweet onions can be stored refrigerated; they have a shelf life of around 1 month. Irrespective of type, any cut pieces of onion are best tightly wrapped, stored away from other produce, and used within two to three days. [40] Varieties Common Onion Group (var. cepa)The onion plant ( Allium cepa), also known as the bulb onion [6] or common onion, [3] :9–10 is the most widely cultivated species of the genus Allium. [7] [8] It was first officially described by Carl Linnaeus in his 1753 work Species Plantarum. [9] A number of synonyms have appeared in its taxonomic history: