Yellow Sweet Spanish Utah Bulb Onion is a classic long-day variety bred for the Utah region, producing large, golden-yellow bulbs with a notably mild and sweet flavor. These onions mature in 110 to 130 days and thrive in zones 3 through 10, making them accessible to gardeners across most of North America. The variety's reputation for sweetness and storage ability has made it a reliable choice for both home gardens and commercial growers seeking substantial, flavorful bulbs.
Full Sun
Moderate
3-10
?in H x ?in W
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Moderate
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This Utah-bred variety produces impressively large bulbs with thin, papery golden-yellow skin that stores exceptionally well. The mild, sweet character of the flesh sets it apart from sharp storage onions, making it equally at home in fresh slicing applications or long-term pantry storage. Starting seeds indoors 10 to 12 weeks before your last frost gives you the longest season to develop truly substantial bulbs, rewarding early planters with noticeably larger harvests.
Yellow Sweet Spanish Utah Bulb Onions excel in any preparation where you want a gentle onion flavor without harsh bite. Slice them raw into salads and sandwiches, caramelize them low and slow for depth without sharpness, or roast them whole for a naturally sweet side dish. Their mild character also makes them ideal for cooking with delicate proteins or in dishes where onion shouldn't dominate. The variety's excellent storage qualities mean you can enjoy these bulbs fresh through winter.
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Start seeds indoors 10 to 12 weeks before your average last frost date. Sow seeds 1/4 inch deep in seed-starting mix and maintain soil temperature ideally between 60 and 85 degrees Fahrenheit for best germination. Transplant seedlings outdoors 4 to 6 weeks before your average last frost date when they are sturdy enough to handle.
Transplant seedlings outdoors 4 to 6 weeks before your average last frost date. Space transplants 12 inches apart in rows 12 inches apart, in soil that has warmed to at least 60 degrees Fahrenheit. The earlier you transplant, the longer the growing season and the larger your final bulbs will be.
You can sow seeds directly outdoors 4 to 6 weeks before your average last frost date as soon as soil can be worked, when soil temperature reaches at least 45 degrees Fahrenheit.
Harvest when bulbs have reached full size and the tops begin to yellow and fall over, typically 110 to 130 days after planting. Once the foliage has mostly dried down, pull or dig bulbs carefully and lay them in a warm, dry, well-ventilated location to cure for 2 to 3 weeks. The papery skin will fully dry and harden during this curing period, sealing in the bulbs for long storage.
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