Utah Yellow Sweet Spanish Onion

Type: Open-pollinated
Packet Size: 25+ seeds

Allium cepa. Utah Yellow Sweet Spanish Onion is a popular long-day onion variety known for its large, globe-shaped bulbs, golden-yellow skin, and mild, sweet white flesh. These flavorful onions are perfect for fresh salads, sandwiches, slicing, grilling, soups, and everyday cooking. This productive variety produces generously sized bulbs that can be cured for storage after harvest. An excellent choice for northern vegetable gardens, Utah Yellow Sweet Spanish Onions thrive in regions with long summer daylight hours and are well suited for raised beds and home gardens.

Long-Day Variety: Best suited for northern growing regions where summer days reach approximately 14–16 hours of daylight, allowing bulbs to develop properly.

🌱 Growing Information

How to Grow Utah Yellow Sweet Spanish Onion from Seed

Planting Depth: ¼ inch
Seed Spacing: 1–2 inches; thin to 4–6 inches
Row Spacing: 12–18 inches
Germination Time: 7–14 days
Days to Harvest: 100–115 days
Sun Requirements: Full Sun
Day Length: Long Day

Planting Tips:
Utah Yellow Sweet Spanish Onions grow best in full sun and fertile, well-drained soil. Start seeds indoors 8–10 weeks before the last frost or sow directly outdoors as soon as the soil can be worked. Transplant or thin seedlings to 4–6 inches apart to allow large bulbs to develop. Keep soil consistently moist during active growth. Harvest when most tops begin to fall over and dry naturally. Cure harvested onions in a warm, dry, well-ventilated location before storing.

Because this is a long-day onion, it performs best in northern regions with approximately 14–16 hours of summer daylight. Gardeners in southern regions may have better results with short-day onion varieties.

🌱 Great for fresh eating, slicing, cooking, raised beds, and cured onion storage.
Pot Size: Deep container (3–5+ gallons)