Allium caeruleum
Allium caeruleum

Allium caeruleum

SKU: F303003
25 for $12.00
Quick Facts
Common Name: Flowering Onion
Hardiness Zone: 3-7S/9W Exposure: Sun
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Blooms In: Jun
Mature Height: 12-18" Spacing: 3"
Read our Growing Guide Ships as: BULB
Deer Resistance: Yes
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Shipping Details Shipment begins in mid September 2021, depending on your zone. See shipping tab for details
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Product Details

Product Details

There are but a few true blues to be found among the Ornamental Onions, and they are prized for the cooling effect they have on the exuberance of late spring. A. caeruleum is a deep, clear blue, and its tiny flowers are arranged in clusters 1″ across. Planted closely this fall, the bulbs will produce a refreshing display at Peony time next spring. Heirloom, 1792. 10–15 per sq ft.

For more information on growing Allium, click Growing Guide.




The size of the plants we ship has been selected to reduce the shock of transplanting. For some, this means a large, bareroot crown. Others cannot travel bareroot or transplant best if grown in containers. We ship these perennials and annuals in 1 pint pots, except as noted. We must point out that many perennials will not bloom the first year after planting, but will the following year, amply rewarding your patience. We ship bulbs as dormant, bare bulbs, sometimes with some wood shavings or moss. Shrubs, Roses, vines, and other woody plants may be shipped bareroot or in pots. The size of the pot is noted in the quick facts for each item.


We ship our bulbs and plants at the right time for planting in your area, except as noted, with orders dispatched on a first-come, first-served basis by climate zone. Estimated dates for shipping are indicated in the Shipping Details box for each item. Please refer to the Shipping Details box to determine the earliest shipping time. Please supply a street address for delivery. Kindly contact us with two weeks notice, if you'll be away at expected time of delivery.


We guarantee to ship plants that are in prime condition for growing. If your order is damaged or fails to meet your expectations, we will cheerfully replace or refund it. Please contact our Customer Service Department at 1-800-503-9624 or email us at [email protected]. Please include your order number or customer number when contacting us.



Average Customer Rating: (5 Reviews) Write a Review

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two of the 50 i planted bloomed. Very disappointing.

6 of 6 people found this review helpful. Do you? yes no  Certified buyer

Forgotten but beautiful

Have always wanted this variety. Forgot where I planted them last Fall. Almost pulled them out when they started to grow. I stopped just in time. They do bloom later than other bulbs but the blue is a clear sky blue. Just great.

37 of 39 people found this review helpful. Do you? yes no  Certified buyer

Little beauties

These are cute as a button and I love the color. For best impact plant them close together in a large grouping.

44 of 45 people found this review helpful. Do you? yes no  Certified buyer

Easy, Showy and VERY Blue

Love these. They are hardy to at least 20 below, easy to grow in any well-drained soil with at least half a day's sun and are a beautiful true blue color.

They have only two problems. They reseed too much and they also produce unattractive bulbils in the seedheads (though these do give you new plants fast).

Also, I wish they were better clumpers. They don't grow in a neat clump. If you plant a dozen bulbs in a small circle though it makes an excellent display.

I would recommend these to any gardener.

77 of 79 people found this review helpful. Do you? yes no


Had several sprouts but no buds. Disappointed. I think the 'roller coaster' temps of this winter did them in. Will keep fingers crossed for next year. Will wait until next year to recommend to friend.

34 of 38 people found this review helpful. Do you? yes no

Growing guide

Growing guide
Print Grow Guide

Latin Name Pronunciation: al'ee-um  

Bulb size: 22-24 cm/12-14 cm/6-8 cm (depending on variety) 

The genus Allium (the Latin means "garlic") includes many garden plants that grow from bulbs or bulb-like rhizomes. Allium flowers form dense balls of color at the top of strong stems, and they make excellent displays in the garden or in bouquets. Allium flowers range from purple, burgundy, lilac, silvery amethyst, pink, blue, to yellow and white. Some varieties have scented blooms, but their perfume is usually pleasant and not the least oniony. The scent of the bulbs and leaves, however, may remind you of onions.

Light/Watering: Most Alliums grow best in full sun, with at least 6–8 hours of direct sun a day. Those we offer require well-drained soil and are longest lived in locations where the soil is on the dry side during summer dormancy.

Planting: Plant Alliums more shallowly than comparably sized bulbs, just 1–2 times the diameter of the bulb deep.

Fertilizer/Soil and pH: Alliums prefer well-drained, fertile soil. Fertilize in fall and spring with any bulb fertilizer.

Continuing Care: The leaf tips of many varieties, especially the tall ones, begin to brown before bloom time. Remove the spent flowers (except from varieties that are sterile, such as 'Globemaster') if you wish to prevent them from self-sowing.

Pests/Diseases: Alliums have few problems except when planted too shallowly or in wet soil.

Companions: Place Alliums behind heavy-foliage plants such as Peonies and Iris. Good for bedding, and in mixed borders. Flower heads are good for drying.

Dividing/Transplanting: Alliums rarely need transplanting or dividing, but this can be done when the bulbs are dormant.