Bulbing Onion
The Yellow Sweet Spanish Onion stands as one of the most reliable and rewarding heirloom varieties a gardener can grow, producing impressive golden bulbs that easily reach one pound each. This long-day variety matures in 100-120 days and thrives in northern regions where summer days stretch 14-16 hours. Its exceptional adaptability and forgiving nature make it particularly beloved by beginning gardeners, while its excellent storage quality ensures you'll have sweet, flavorful onions well into winter.
Full Sun
High
3-10
?in H x ?in W
Biennial
High
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What sets this Spanish heirloom apart is its remarkable combination of size, sweetness, and reliability. These golden giants consistently grow to a full pound each while maintaining excellent storage quality that keeps them fresh for months. The variety's forgiving nature makes it one of the easiest onions to grow successfully, adapting well to various conditions while delivering consistently impressive results. Its long-day photoperiod requirements make it perfectly suited for northern gardeners seeking a dependable, flavorful storage onion.
These large, sweet onions excel in any culinary application where you want substantial onion flavor without overwhelming bite. Their impressive size makes them perfect for stuffing, grilling whole, or slicing into thick rings for caramelizing. The sweet flavor profile works beautifully in soups, stews, and roasts where you want the onion to contribute both substance and gentle sweetness. Their excellent storage quality makes them ideal for winter cooking when fresh onions become precious.
Start seeds indoors 8-12 weeks before the last expected frost date. Sow seeds 1/4 inch deep in seed-starting mix at temperatures between 45-80°F. Seeds will sprout in 7-14 days. If seedling tops reach over 5 inches before transplant time, trim them back to 3 inches to encourage strong root development.
Transplant hardened seedlings 4-6 weeks before the last frost date, as these onions can tolerate light frosts. When planting out, carefully separate seedlings and place them in a shallow trench, then fill the trench around the seedlings and water in well. Space transplants 4-6 inches apart in rows 12 inches apart.
Direct sow seeds 1/4 inch deep, then thin to the strongest plant when seedlings reach 4-5 inches tall.
Harvest when the tops turn yellow and fall over naturally, typically 100-120 days from seed. When about half the tops have fallen, push over the remainder and wait about one week before harvesting. After harvest, cure in a warm (75-80°F), shaded, well-ventilated location until the outer skin and necks are completely dry, about 2-4 weeks. Once cured, trim tops leaving one inch above the bulb.
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