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Onionology™ - Urban Farmer's Guide
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Long Day Onions: Also referred to as sweet onions. Long day onions are more appropriate for northern states because they are adapted to longer days. Long day onions form bulbs with more sun, around 15-16 hours of daylight. An exceptional long day onion is the 'White Sweet Spanish' a standard large sweet onion which matures in 128 days.
Short Day Onions: Southern states should use short-day varieties of onions. Short day onions develop bulbs with an average of about 12 hours of daylight. If looking for a tasty short day onion try the 'Texas Early Grano', a softball sized, straw colored onion that stores for months and matures in 168 days.