• A close-up shot of a allium flowers with blue petals and green stems.
  • 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 (Small) - Blue Caeruleum

The rarest flowering onion, these blue blooms are a hit among pollinators

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About the Variety

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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 caeruleum

LIFE CYCLE

  • Perennial

LIGHT REQUIREMENT

  • Full Sun
  • Partial Shade

BLOOM SEASON

  • Summer

GROWTH HABIT

  • Clumping

PLANT HEIGHT

  • 14 to 16 inches

PLANT TYPE

  • Small

COLOR

  • Blue

Allium blooms are unique and eye catching enough in the garden, but Allium Caeruleum brings a little something extra--a vivid, true blue flower! Also known as Persian Onion, or Blue Onion, this lovely perennial is one you won't want to pass up!

  • 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

  • 2-3 inches

WATER NEEDS

  • Average

PLANT SPACING

  • 3 inches

HARDINESS ZONES

  • 4
  • 5
  • 6
  • 7
  • 8
  • 9

COVERAGE

Amount Recommended Coverage
20 Bulbs / Ships in Fall Up to 2 Sq. Ft
40 Bulbs / Ships in Fall Up to 4 Sq. Ft
100 Bulbs / Ships in Fall Up to 10 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 (Small) - Blue Caeruleum

$23.49

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Allium Bulbs (Small) - Blue Caeruleum FAQs

What size bulbs will I receive with Blue Caeruleum Allium?

The bulbs for Blue Caeruleum Allium measure 4-5 cm in circumference.

What is Blue Caeruleum Allium also known as?

Blue Caeruleum Allium is also known as Blue Globe Onion, Blue Ornamental Onion, Blue-Of-The-Heavens, and Blue-Flowered Garlic.

Is Blue Caeruleum Allium resistant to animals or disease?

Blue Caeruleum 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 Blue Caeruleum Allium grown from?

Blue Caeruleum Allium is grown from a bulb.

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