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Here's how to grow onions in your own garden, including growing onions from seed and growing from food scraps, and when to pick them in the spring.
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
"Short-day" onions, which have been developed in more recent times, are planted in mild-winter areas in the autumn and form bulbs in the early spring and require only 11–12 hours of daylight to stimulate bulb formation. [66] Onions are a cool-weather crop and can be grown in USDA zones 3 to 9. [67]
From fruit and vegetables to grow from seed to bare root perennials and summer-blooming annuals, find 12 easy-to-grow plants to plant in April here.
The cultivation of Vidalia onions started in the early 1930s. The Granex and related varieties are sweeter than other onions, but the unusual sweetness of Vidalia onions is due to the low amount of sulfur in the soil in which Vidalia onions are grown. The Vidalia onion was named Georgia's official state vegetable in 1990.
[3] [4] Photoperiodic flowering plants are classified as long-day plants or short-day plants even though night is the critical factor because of the initial misunderstanding about daylight being the controlling factor. Along with long-day plants and short-day plants, there are plants that fall into a "dual-day length category".