• A vibrant, large purple globe-like allium giganteum stands tall against a blurred green background.
  • A close-up shot of a variety of Allium bulbs, showing their different sizes, shapes, and colors.
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Ships Fall 2026

Allium Bulbs (Giant) - Giganteum

Our largest allium with purple globes the size of a softball

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About the Variety

Key Features

Frost Tolerant
Drought Tolerant
Container Friendly
Attracts Bees
Attracts Butterflies
Fast Growing
Easy to Grow
Perfect for Cut Flowers
Perfect for Dried Flowers
Deer Resistant
Rabbit Resistant
Rodent Resistant

Plant Details

BOTANICAL NAME

Allium

LIFE CYCLE

  • Perennial

LIGHT REQUIREMENT

  • Full Sun
  • Partial Shade

BLOOM SEASON

  • Early Summer

GROWTH HABIT

  • Clumping

PLANT HEIGHT

  • 48 inches

PLANT TYPE

  • Giant

COLOR

  • Purple

The majestic and stunning Giganteum allium is perhaps the tallest available allium on the market, with blooms the size of a softball, it grows up to 5 feet tall. Giganteum is a fall planted flower bulb that blooms from late spring into early summer. Like all alliums, Giganteum is best planted in clumps of 10 or more bulbs to create a stunning and unusual effect in the late spring garden. Giganteum alliums should be planted in a sheltered location to protect the blooms from strong winds. Giganteum allium is excellent for either cut flower or dried flower arrangements.

  • • Easy to Grow Pollinator Attractor, Perfect for Beds, Borders and Cottage Gardens
  • • Numerous Small Star-Shaped Blooms that Form Globe-Shaped Clusters
  • • Wild Ornamental Flowering Onion, Deer-Resistant Perennial

Planting Information

PLANTING SEASON

  • Fall

PLANTING DEPTH

  • 6 inches

WATER NEEDS

  • Average

PLANT SPACING

  • 5 to 6 inches

HARDINESS ZONES

  • 4
  • 5
  • 6
  • 7
  • 8
  • 9

COVERAGE

Amount Recommended Coverage
2 Bulbs / Ships in Fall Up to 1 Sq. Ft
4 Bulbs / Ships in Fall Up to 2 Sq. Ft
10 Bulbs / Ships in Fall Up to 5 Sq. Ft

Planting Guide

View our Allium Planting Guide to learn more.

Ready to Grow

We guarantee that our seeds & bulbs will be true to type and ready to thrive. If something doesn't grow as expected, we will make it right. Questions? Call us at 855-440-2929

Allium Bulbs (Giant) - Giganteum

$29.49

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Allium Bulbs (Giant) - Giganteum FAQs

What size bulbs will I receive with Giganteum Allium?

The bulbs for Giganteum Allium measure 20-22+ cm in circumference, the largest size commercially available for this variety.

What is Giganteum Allium also known as?

Giganteum Allium is also known as Giant Onion, Ornamental Onion, and Flowering Onion.

Is Giganteum Allium resistant to animals or disease?

Giganteum Allium is deer resistant and rabbit resistant, meaning deer and rabbits generally avoid it due to its taste, texture, or aroma.

What type of bulb is Giganteum Allium grown from?

Giganteum Allium is grown from a bulb.

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