Onions are a great pick for the home gardener. They grow well in most parts of the U.S. and have many uses in the kitchen. You can grow them specifically for green onions or you can let them mature and harvest them for their large bulbs. You can also choose to grow onions and use a few early as green onions, harvesting the remainder as delicious bulb onions.
There are also special kinds of onions that donâ€™t develop bulbs and that are used exclusively for green onions. Onions are a popular cool season vegetable and although they are considered a biennial plant they are grown as annuals.
The onion is exceptional in that it will thrive under a very wide range of climatic and soil conditions. There is perhaps no extended area in the United States, except for the mountainous regions, where the onion cannot be successfully grown. However, onions grow best in temperate climates without great extremes of heat and cold.
Onions grow in an unusual manner. They start growing the large bulbs we know as onions when the levels of daylight reach an appropriate level for them to start forming. The time that you plant the onions affects when they form bulbs. If you plant your onions too late in the season, they may not form bulbs properly.
One important thing to remember about onions is that there are two different classes: long-day and short-day onions. Long-day onions are more appropriate for northern states because they are adapted to longer days. Southern states should use short-day varieties of onions. When you go to your nursery, they will usually list long-day onions as L and short-day onions as S. Short day onions develop bulbs with an average of about 12 hours of daylight. Long-day onions form bulbs with more sun, around 15-16 hours of daylight. You should grow the kind of onion appropriate for your region to ensure proper maturation of the onion bulbs. Keep reading for more information about long-day and short-day onions.