Blanco Duro Onion Seeds – White Storage Onion Heirloom – 50 Seeds

Blanco Duro is a classic white storage onion prized for its firm, crisp bulbs and excellent keeping quality. This heirloom variety produces uniform, globe-shaped onions with thin, papery white skin and mild, sweet flavor that becomes more pungent as the bulbs mature. It is a reliable choice for home gardeners who want a steady supply of onions for fresh use and long-term storage.

Whether you grow them for salads, sandwiches, soups, or caramelizing, Blanco Duro onions adapt well to a range of culinary uses. Their sturdy bulbs store well in a cool, dry place, making them a practical addition to the vegetable garden and pantry.

Plant Features

• Heirloom white storage onion with firm, crisp bulbs
• Mild, sweet flavor that intensifies with maturity
• Excellent keeping quality for long-term storage
• Uniform globe-shaped bulbs with thin white skin
• Versatile for fresh eating and cooked dishes

Growing Information

• Botanical Name: Allium cepa
• Plant Type: Biennial grown as annual
• Sunlight: Full sun
• Soil: Well-drained, fertile soil rich in organic matter
• USDA Zones: 3-10
• Growth Habit: Upright, bulb-forming
• Bloom Season: Not typically grown for bloom
• Mature Height: 12-24 inches
• Germination: 7-14 days at 65-75°F

Planting & Care

Start Blanco Duro onion seeds indoors 8-10 weeks before the last frost date. Sow seeds 1/4 inch deep in a sterile seed-starting mix, keeping the soil consistently moist but not waterlogged. Provide bright light and maintain temperatures around 65-75°F for reliable germination. Harden off seedlings before transplanting outdoors after the last frost.

Plant seedlings 4-6 inches apart in rows spaced 12-18 inches apart. Keep the area weed-free and water regularly, especially during dry spells. Stop watering when the tops begin to yellow and fall over, signaling maturity. Harvest bulbs and cure them in a warm, dry, well-ventilated area before storing in a cool, dark place.

What's Included

50 Blanco Duro Onion seeds.