Seed companies from northern areas usually only offer long-day varieties. The dry season onion is normally grown in basins under favourable conditions of day length and temperature when the plant has reached a certain stage of growth. Three Ways to Grow Onions From Seed Plant a diverse crop of onions, including a variety or two that stores well, and enjoy garden-fresh onions year-round. (All of these are hybrids.) While they can be planted in northern locations, the bulbs tend to be smaller. They tend to be planted in the autumn where the winter is milder, or in the spring for colder climates. If sowing in rows then space the rows about 30cm apart. For instance, in the north, from San Francisco to Washington, D.C. (zone 6 or colder), summer days are long, so you would grow long-day onions. This variety of onion is super sweet, will mature in 110 days and does best in growing zones 5-6. Grown in warm climates, they mature within 110 days when planted in the fall. Short-day onions are grown between the 35th parallel and the equator, since they don’t produce bulbs under long days. True bunching onions or scallions (Allium fistulosum) grow as perennials in U.S. Department of Agriculture plant hardiness zones 6 through 9. Perfect for trying several varieties in a small plot. When you’re choosing which type of onion to plant in your garden, color might be one of the last things you think abo… More on onion growing read: How to Grow Onions and Onion Seed Starting Tips. You may think an onion is an onion is an onion – all good on a burger or diced into chili. Northern European and Alaskan varieties need sixteen hours or more. Most onion varieties begin to form a bulb when the temperature and the number of daylight hours reach certain levels. Intermediate-day onions form bulbs when the daylight ranges from 12 – 14 hours long. Our onion plants are easy to grow — just separate and transplant out. They need 14 to 16 hours of sunlight per day, otherwise no bulb is formed. That means throughout Canada and the northern states of the USA and through most of Europe and Northern Asia as well. They start forming bulbs with a daylength of 12-14 hours. If you grow an onion in the wrong area and no bulb forms, all is not lost: you can still use it as a green onion. Cure your onions for longer storage. 1 The type of onion grown will depend on the latitude of the growing region. Ailsa Craig; Italian Torpedo; Red Burgundy; Utah Yellow Sweet Spanish; Walla Walla; White Grano; White Sweet Spanish; Storage Onions. They take approximately 110 days to mature in the south and just 75 days in the north. Source: imgur.com. Candy grows almost everywhere! Source: gardenerd.com. Day-neutral onion varieties include: Red Candy Apple, Candy, and Superstar. Short-day, neutral-day, and intermediate-day onion varieties are generally sweet and mild. In the south (zone 7 and warmer), summer days don’t swing much in length in comparison to winter days, so grow short-day onions. Short-day onions need 10 hours of daylight. Day length determines whether onions form a bulb, so you need to plant the right kind, depending on where you garden. From northern Texas to the Canadian border, this variety provides a sweet onion for mid and northern areas. Day-neutral Onion Varieties The border between long- and short-day varieties lies roughly at 36 degrees north latitude (aka, the 36th parallel)—north of this line, plant long-day varieties; south of … Examples of short-day onion varieties include Texas Supersweet and Red Creole. Long-day onion varieties need fourteen to fifteen hours of daylight to make a bulb; these varieties grow best in northern states and Canada. If you grow an onion in the wrong area and no bulb forms, all is not lost: you can still use it as a green onion. Planting date: Onion setts then they can be planted around Mid to Late March. Excellent choice for beginner gardeners, this is one of the easiest and most adaptable onions to grow. Day-neutral onions tend to be intermediate in taste and shelf life compared to long- and short-day onions. They require a mild winter climate in zone 7 or warmer. Bunching Onions. One of the secrets to getting top quality from day-neutral varieties (which perform great in the central US) is to keep them growing fast and vigorously, with no interruptions. A popular variety of day-neutral onion is the appropriately named Candy Onion but there’s also Sweet Red and Cimarron. Long-day onions tend to have a strong taste and store well. Any bulb-forming onion variety can be ha… In the tropics such as Nigeria, only short day or day neutral onion varieties will form bulbs. Plant in full sun and well-draining soil. Choosing Which Storage Onion to Grow . 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