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Giant Onion

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Giant Onion (Allium giganteum)

Giant Onion (Allium giganteum), also known as Giant Allium, is a towering, clump-forming perennial known for its striking, globe-shaped violet-purple flower clusters and sturdy, upright foliage. With its bold presence and pollinator-friendly nature, it is an excellent choice for borders, cutting gardens, and architectural focal points.

Distinctive Features

Giant Onion produces large, spherical clusters of violet-purple flowers that rise on strong, tall stems in early to mid-summer, adding height and dramatic interest to the landscape. Its strap-like green leaves emerge in spring, providing contrast before the flowers appear. This variety is highly resistant to deer and rabbits, making it a reliable addition to any garden.

Growing Conditions

  • Sun Exposure: Prefers full sun for best flowering.
  • Soil: Requires well-draining, sandy or loamy soil.
  • Water: Low to moderate watering; prefers dry to moderately moist conditions.
  • Humidity: Tolerant of various humidity levels but prefers good air circulation.
  • USDA Hardiness Zones: 4-9, making it suitable for a wide range of climates.

Ideal Uses

  • Garden Borders: Provides vertical structure and striking color.
  • Architectural Focal Points: Adds drama and height to mixed plantings.
  • Cutting Gardens: Long-lasting flowers are excellent for arrangements.
  • Pollinator Gardens: Attracts bees and butterflies with its nectar-rich blooms.

Low Maintenance Care

Giant Onion is an easy-care perennial that thrives with minimal attention.

  • Watering: Drought tolerant once established; water occasionally in dry spells.
  • Pruning: Deadhead spent flowers to maintain a tidy appearance.
  • Fertilizing: Requires little feeding; a light application of balanced fertilizer in spring is sufficient.
  • Pest Resistance: Highly resistant to deer and rabbits.

Why Choose Giant Onion?

Giant Onion is valued for its towering blooms, adaptability, and low-maintenance nature, making it a standout choice for various landscapes.

  • Large Violet-Purple Flower Clusters: Creates a bold statement in any garden.
  • Tall & Dramatic Growth: Provides height and architectural interest.
  • Drought & Deer Resistant: Thrives in tough conditions with minimal care.
  • Low Maintenance: A reliable, easy-care perennial.

For a striking, resilient, and easy-to-grow addition to any garden, Giant Onion (Allium giganteum) is an exceptional choice.

OUR SIZING

Not sure what 2 inch B&B or 30 Gallon Clump really means? This guide breaks down all our plant size terms so you know exactly what to expect, whether you're ordering online or picking up at our nursery. From caliper measurements to container volumes, we've decoded our system to help you shop with confidence.

See Size Guide

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