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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.
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
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 ...
Allium validum is a species of flowering plant commonly called swamp onion, wild onion, Pacific onion, or Pacific mountain onion. It is native to the Cascade Range , the Sierra Nevada , the Rocky Mountains , and other high-elevation regions in California , Oregon , Washington , Nevada , Idaho and British Columbia .
Tree onions are also known as topsetting onions, walking onions, or Egyptian onions. Genomic evidence has conclusively shown that they are a diploid hybrid of the shallot and the Welsh onion (A. fistulosum). [2] [3] [4] However, some sources may still treat the tree onion as A. cepa var. proliferum or A. cepa Proliferum Group.
Allium tricoccum with open inflorescence bud (June 6). Allium tricoccum is a perennial growing from an ovoid-conical shaped bulb that is 2–6 cm (1–2 in) long. [4] Plants typically produce a cluster of 2–6 bulbs that give rise to broad, [5] flat, smooth, light green leaves, that are 20–30 cm (8–12 in) long including the narrow petioles, [4] often with deep purple or burgundy tints on ...
The potato onion (also known as an Egyptian onion, underground onion [1] or multiplier onion) [2] is a group of varieties [3] which Maud Grieve calls Allium × proliferum [1] but has also been classed in the Aggregatum Group of Allium cepa, similar to the shallot. [3]
Allium giganteum, common name giant onion or giant leek, is an Asian species of onion, native to central and southwestern Asia but cultivated in many countries as a flowering garden plant. [ 4 ] [ 5 ] It is the tallest species of Allium in common cultivation, growing to 1.5 metres (4.9 ft).