Calories in an Onion


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This page talks about calories in an onion as well as the three different onions.

Onion bulbing is triggered by day length, and maximum day length during the growing season increases from south to north. Short-day onions are grown at lower latitudes in the south, while intermediate and long-day onions are grown at higher latitudes.

There are several day lengths:  Long Day, Short Day and Intermediate Day.

Onion Day Length MapOnion Day Length Map

Generally speaking, long-day onions tend to do best in the North and short-day types tend to do best in the South. Growing onions from seed is often the only way to get varieties really suited to your location. Heirloom onion seeds are usually started indoors in late winter for transplanting outside a month or so before the last frost of spring.

Short-day onions start the bulbing process when day-length reaches 10-12 hours.  They mature in 110 days when planted in the south during winter or early spring.  They mature in  75 days when planted in northern states in late spring but will not get very large.  The earlier you plant them, the larger they get.

Some of the onions that work best for this are the

Intermediate day onion varieties are the most widely adaptable since they require 12-14 hours of sunlight before beginning the bulbing process. Unless you live in far south Florida or south Texas you should have enough daytime hours to make nice-sized bulbs. When planted at the proper time, intermediate day onion varieties mature in approximately 100 days.

Some of the onions that work best for this are the

Long day sweet and storage onion varieties do well in the northern states that have between 14-16 hours of daylight length. Long day sweet onion varieties generally mature a few weeks before long day storage onion varieties and will keep from one to four months, so eat them first. These varieties will do best from the Midwest to the Canadian border. If planted early, long day onion varieties will do well in the northern half of the intermediate day areas.

Some of the onions that work best for this are the

Onions come in three colors:  red, white and yellow.  They have about 44 calories.   The more color the more anti-oxidants that the onion has.

Onions may have several health benefits, mostly due to their high content of antioxidants and sulfur-containing compounds.

They have antioxidant and anti-inflammatory effects and have been linked to a reduced risk of cancer, lower blood sugar levels, and improved bone health.

Commonly used as a flavoring or side dish, onions are a staple food in many cuisines. They can be baked, boiled, grilled, fried, roasted, sautéed, powdered, or eaten raw.

Onions vary in size, shape, and color, but the most common types are white, yellow, and red. The taste ranges from mild and sweet to sharp and spicy, depending on the variety and season.

Onions can also be consumed when immature, before the bulb reaches full size. They are then called scallions, spring onions, or summer onions.

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All of the variety information on the David's Garden Seeds® website, including the days to maturity, color and size are based on data from tests done at specific locations. Many factors, including geographic location, daytime and nighttime temperatures, the availability of plant nutrients, many unknown climate factors and insects/pest interact to determine a variety's performance. For information on which varieties will perform best in your area, we recommend that you contact your local county extension agent or a Master Gardener.

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Here at David’s Garden Seeds®, gardening is our passion. We provide top quality, non-GMO seeds so families can learn about gardening and love it.  In turn, we hope they will pass this passion down to their children and grandchildren, teaching them to grow  delicious food, fresh herbs and beautiful flowers.