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Message: <blockquote data-quote="2busy" data-source="post: 4276318" data-attributes="member: 12213">The bulbing process is initiated by daylight length. You want as much top growth before the bulbing is started. You also want a short day or intermediate day onion variety. Short day varieties will begin bulbing up first. They require less daylight length.Intermediate day will be second to bulb up. You'll get bigger bulbs as they will usually have a few more leaves before they start bulbing up.The only problem with these two types are they do not have a very long storage life.Most long day varieties have the longest shelf life but they need longer daylight length for bulbing up. They are grown in northern states because the the daylight length is longer in the summer.</blockquote>