By choosing the right type of onion for your region, you'll get healthy green stems that are large enough to fuel forming fat and tasty bulbs. Conversely, if you live where daylength never hits 14 hours, long-day onions will never form a bulb. If the top of the plant hasn't had enough time to grow big and lush, the resulting bulb will be small. As soon as daylength hits the 10-hour mark, a short-day onion starts forming a bulb. Day-neutral onions form bulbs regardless of daylight hours and produce well in almost any region. Short-day onions need 10 hours of daylight.

Long-day onions need about 14 to 15 hours of daylight to bulb. When the number of daylight hours reaches a certain level, onion plants start bulbing, or forming bulbs. Onions form bulbs in response to daylength. Here's how to tell which onion is right for you. If you plant the wrong one, you may not get much of a harvest. There are three types of onions, each one better suited for a certain part of the country. You may have started with the wrong onion. If you have ever planted onions only to grow a lackluster harvest of small bulbs, your growing technique may not be the issue.

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