100 Giant Onion - Allium Giganteum Seeds

Allium Giganteum, also known as Giant Onion, is one of the most visually commanding plants you can add to a garden. Known for its towering 3–5 foot stems and perfectly spherical blooms, this ornamental onion makes a bold architectural statement in spring landscapes. Each seed yields a burst of globe-shaped flowers 4–6 inches wide in rich shades of violet, standing high above lush, strappy foliage.

We grow Allium Giganteum for its ability to stop people in their tracks. It delivers vertical drama without fuss, performing beautifully in perennial borders, flower beds, and pollinator gardens. Once established, these hardy bulbs return every year with minimal maintenance, attracting bees, resisting deer, and thriving in full sun with well-drained soil.

Whether you’re designing a cutting garden or just adding structure to a mixed planting, Allium Giganteum gives back more than it asks. The dried seed heads even make stunning additions to fall arrangements or winter garden silhouettes.

🌱 Why Grow Giant Onion – Allium Giganteum Seeds

• Massive 4–6 inch violet blooms on 3–5 foot stems
  
• Returns yearly as a cold-hardy perennial
  
• Attracts pollinators while resisting deer and rabbits
  
• Adds striking vertical interest to flower beds
  
• Dried seed heads make beautiful natural decor

🌿 Growing Tips

1. Sow seeds in late summer or fall for natural stratification
   
2. Plant in full sun with well-draining, sandy or loamy soil
   
3. Space 12–18 inches apart to allow room for mature blooms
   
4. Water moderately but avoid soggy soil
   
5. Allow foliage to die back naturally after bloom to feed the bulb
   
6. Cold hardy to USDA zones 4–9

❓ Frequently Asked Questions (FAQ)

How tall do Allium Giganteum plants grow?
Stems can reach up to 5 feet tall with flower heads 4 to 6 inches wide.

Are these edible onions?
No, Allium Giganteum is ornamental. While part of the allium family, it’s grown purely for its dramatic flowers, not culinary use.

When should I plant the seeds?
Sow in late summer or early fall outdoors. Seeds benefit from a period of cold to germinate properly in spring.

Do I need to replant each year?
No. Once established, these are reliable perennials and will return each season with proper care.

Will they bloom the first year?
From seed, expect blooms in the second or third growing season as the bulb matures.

Can I grow these in containers?
It’s possible, but due to their height and root depth, they perform best in open ground or deep planters.