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Long Day Onion Seeds. Allium cepa. Non-GMO. Perennial. Open Pollinated. (F1). Heirloom. Disease Resistant. We have over 17 varieties of Long Day Onions. The plants produce excellent yields of very flavorful, sweet onions. Long Day Onions are usually better for storage onions. Suitable for growing in Northern States, 37 - 47 degrees latitude regions, where the summer days are long. They require 14 - 16 hours of daylight to form bulbs. It's the one found in your local supermarket and restaurants. Excellent choices for home gardens, Farmer's Markets, market growers, open field production, and commercial growers.