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James H. Schutte
Liliaceae
Allium caeruleum
Blue Ornamental Onion
Blue ornamental onion is a perennial bulb grown for its small clusters of azure blue, star-shaped flowers. In late spring to early summer, each plant puts forth multiple leafless stems topped with one flower cluster. The green strap-like foliage appears before plants bloom and often dies back before flowers the appear. This onion has a lightly oniony fragrance when its leaves or stems are crushed.
Blue ornamental onion is originates from the mountains of northern and Central Asia where it grows in sharply drained soil and full sun. Plant it in fall four to five inches deep to the base of the bulb. Rot can result if planted in overly moist ground, so make sure your soil’s drainage is good. This allium has a subtle beauty and looks best when planted among other showy bulbs and perennials in the garden.
10 - 1
4 - 10
1a, 1b, 2a, 2b, 3a, 3b, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Bulb or Corm or Tuber
Full Sun
12"-24" / 30.5cm - 61.0cm
8"-12" / 20.3cm - 30.5cm
Late Spring, Early Summer, Summer
Asia, Central Asia
Neutral
Well Drained
Loam, Sand
Medium
Average Water
Spring, Summer
Showy
Light Blue, Blue Violet
Green
Yes
No
Single
Matte
Alpine, Cutflower, Mixed Border, Rock Garden / Wall
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