Allium Seeds – Giganteum

Allium ‘Giganteum’ is one of the most spectacular ornamental onion varieties, prized for its tall stems and large, globe-shaped blooms. Each plant produces impressive, round flower heads made up of hundreds of tiny violet-purple florets, adding height and elegance to any garden. This striking variety is ideal for borders, cottage gardens, and landscape focal points. Long-lasting in bloom and as dried flowers, Allium Giganteum attracts pollinators like bees and butterflies while being deer and rabbit resistant.

Features:

• Produces large spherical violet-purple flower heads up to 6 inches wide.

• Adds vertical interest and structure to garden landscapes.

• Attracts bees and butterflies while deterring deer and rabbits.

• Excellent for both fresh cut and dried floral arrangements.

• Easy to grow and low maintenance once established.

• Hardy and suitable for a wide range of climates.

Specifications:

• Scientific Name: Allium giganteum

• Common Name (US): Ornamental Onion

• Plant Type: Perennial (bulbous)

• Bloom Color: Violet to Purple

• Bloom Size: Up to 6 inches across

• Plant Height: 36–48 inches (90–120 cm)

• Sunlight Requirement: Full Sun

• Soil Type: Well-drained, sandy or loamy soil

• Watering: Moderate; avoid overwatering

• Germination Time: 21–28 days

• Days to Bloom: Blooms in late spring to early summer

• Sowing Method: Start indoors or direct sow outdoors in fall for best results

• Spacing: 8–12 inches apart

• Growing Season: Spring to Early Summer

• USDA Hardiness Zones: 4–9

• Best Planting Months (by Zone):

  • Zones 4–6: September to October

  • Zones 7–9: October to November

• Use: Garden borders, mixed beds, landscape accents, floral arrangements