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Because onions can take more than 5–6 months to reach maturity, many growers with shorter growing windows prefer to grow onions from starter bulbs rather than seed. 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.
Onion Sets: small bulbs from the previous harvest are not allowed to mature and are dried. These bulbs are used in the current season, and often grow the quickest out of all planting methods and produce larger than natural bulbs. [22] [24] Onion Seeds: seeds of the white onion that can be planted into sets in late Spring. While this method may ...
Onions are a cool-weather crop and can be grown in USDA zones 3 to 9. [67] Hot temperatures or other stressful conditions cause them to "bolt", meaning that a flower stem begins to grow. [68] Onions are grown from seeds or from partially grown bulbs called "sets" or starter bulbs. Onion seeds are short-lived and fresh seeds germinate more ...
4: Development of harvestable vegetative plant parts 41: 401: Leaf bases begin to thicken or extend 43: 403: 30% of the expected bulb or shaft diameter reached 45: 405: 50% of the expected bulb or shaft diameter reached 47: 407: Bolting begins; in 10% of the plants leaves bent over 3. 70% of the expected shaft length and diameter reached 4. 48: 408
The pearl onion (Allium ampeloprasum var. sectivum or A. ampeloprasum 'Pearl-Onion Group'), [1] also known as button onion, baby onion or silverskin onion in the UK, [2] is a close relative of the leek (A. ampeloprasum var. porrum), and may be distinguished from common onions by having only a single storage leaf, [3] similar to cloves of garlic.
Congdon's onion Allium sanbornii Alph. Wood var. congdonii Jeps. Crinkled onion Allium crispum Greene Cuddy Mountain onion Allium fibrillum M.E. Jones Cultivated garlic Allium sativum L. Darkred onion Allium atrorubens S. Watson and vars. atrorubens, cristatum Dotted onion Allium punctum L.F. Hend. Douglas' onion Allium douglasii Hook. Drummond ...
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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]