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

Blanco Duro is a classic heirloom white onion prized for its firm, dense bulbs and excellent storage quality. These white onions produce uniform, globe-shaped bulbs with crisp, mild-flavored flesh that is perfect for fresh slicing, cooking, and pickling. As a storage onion, Blanco Duro is an excellent choice for gardeners who want to grow a reliable crop that keeps well after harvest.

Easy to grow from seed, Blanco Duro performs well in full sun and well-drained soil. Whether you are planting a vegetable garden, raised bed, or container, these onion seeds offer a rewarding harvest of homegrown white onions.

Plant Features

• Heirloom white storage onion variety
• Produces firm, globe-shaped bulbs
• Mild, crisp flavor ideal for fresh use and cooking
• Excellent storage quality for long-term keeping
• Grows well in full sun and well-drained soil

Growing Information

• Botanical Name: Allium cepa
• Plant Type: Biennial grown as annual
• Sunlight: Full sun
• Soil: Well-drained, fertile soil
• Water Requirements: Moderate; keep soil evenly moist
• Growth Habit: Upright, bulb-forming
• USDA Hardiness Zones: 3-9
• Mature Height: 18-24 inches
• Spacing: 4-6 inches apart

Planting & Care

Sow Blanco Duro onion seeds indoors 8-10 weeks before the last frost, or direct sow outdoors in early spring once the soil can be worked. Plant seeds about 1/4 inch deep and keep the soil consistently moist until germination. Thin seedlings to 4-6 inches apart to allow room for bulb development.

Onions require consistent moisture during the growing season but should be watered less as bulbs mature to encourage proper curing. Stop watering when tops begin to yellow and fall over. Harvest bulbs when necks are dry and tops have browned, then cure in a warm, dry, well-ventilated area before storing.

What's Included

50 Blanco Duro onion seeds.