ONION Seeds, Yellow Sweet Spanish

Yellow Sweet Spanish (Allium cepa) is a long-day heirloom bulb onion that produces large, round, golden-skinned bulbs with sweet, mild, pale flesh. It is a classic main-crop onion valued for its size and gentle flavor, good for fresh eating and medium-term storage.

At a glance

• Botanical name: Allium cepa 'Yellow Sweet Spanish'
• Type: Heirloom, open-pollinated, long-day onion
• Days to maturity: about 110 to 120 days from transplant
• Sun: Full sun
• Spacing: 4 inches apart in rows 12 to 18 inches apart
• Planting depth: 1/4 to 1/2 inch
• Mature height: 12 to 18 inches

Best for

• Fresh slicing for salads and sandwiches
• Grilling and roasting
• Caramelizing for sauces and soups
• Sauteing and stir-fries
• Medium-term kitchen storage

How to grow

Start seeds indoors 8 to 10 weeks before the last frost, or sow directly once the soil can be worked. Grow in full sun in loose, fertile, well-drained soil with a slightly acidic to neutral pH. Keep moisture consistent during bulbing, then reduce watering as the tops begin to fall over near harvest. As a long-day type, it bulbs best in northern regions where summer days are long.

Flavor profile

Sweet and mild with low pungency, turning richer and more savory when cooked or caramelized.

About 99Heirlooms

99Heirlooms specializes in non-GMO, open-pollinated heirloom seeds chosen for flavor and reliability, so you can grow proven varieties and save seed season after season.