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Onion seeds are cultivated in the spring and the resultant bulbs are harvested in autumn. These bulbs are similar in appearance to the mature onion, but much smaller in size. The starter bulbs are stored in a cool, dark place over winter. The next spring, the starter bulbs are planted in rows, 8 to 10 cm (3 to 4 in) apart. [1] Although this ...
The onion plant (Allium cepa), also known as the bulb onion [2] or common onion, [3] is the most widely cultivated species of the genus Allium. [4] [5] It was first officially described by Carl Linnaeus in his 1753 work Species Plantarum. [6] Synonyms during its taxonomic history are: [7] [8] Allium cepa var. aggregatum – G. Don
It is possible to devernalize a plant by exposure to sometimes low and high temperatures subsequent to vernalization. For example, commercial onion growers store sets at low temperatures, but devernalize them before planting, because they want the plant's energy to go into enlarging its bulb (underground stem), not making flowers. [24]
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Intermediate day onions are onions that will form mature bulbs when they are in an environment where they get 12 to 14 hours of sunlight a day. [27] [29] [22] Long-day onions are onions that form bulbs when they are in an environment where they get 14 to 16 hours of sunlight a day. [27] [30] [22] For most white onion varieties, a soil pH of 6-7 ...
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It sometimes produces irregular-shaped [2] or round bulbs, [1] [3] which in some old English varieties may be large, [1] [3] although others may be less so. [2] According the french ethnobotanist Michel Chauvet, the potato onion, also called family onion, forms several more or less flattened bulbs which, unlike shallots, remain enveloped in ...
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