Allium caeruleum (blue globe onion, blue ornamental onion, blue-of-the-heavens, blue-flowered garlic; syn. Allium azureum Ledeb.) is an ornamental bulbous plant of the onion genus, native to Central Asia (Kazakhstan, Kyrgyzstan, Siberia, Tajikistan, Uzbekistan, and Xinjiang).[3][4][5] In these regions, it is found on dry slopes, plains, and steppes.[6]
This plant is cited in the Flore des Serres et des Jardins de l'Europe puis L'illustration horticole by Charles Antoine Lemaire. It grows to 80 cm (31"), producing strap-shaped leaves and small globes (umbels) of blue flowers in early summer. The one-inch wide globular flower heads attract butterflies.[7] The plant has been granted the British Royal Horticultural Society's Award of Garden Merit (1993).[8]
A. caeruleum thrives in well-drained soil in full to partial sun.[9] It is deer-resistant and suitable for USDA hardiness zones 4–8.[6]
^illustration from Flore des serres et des jardins de l’Europe by Charles Lemaire and others. Gent, Louis van Houtte, 1847, volume 3 (plate 300).
^The Plant List
^"NC State University: Allium caeruleum". Archived from the original on 2007-07-04. Retrieved 2007-04-06.
^Flora of China Allium caeruleum 棱叶薤 leng ye xie
^Peter Simon von Pallas. 1773. Reise durch verschiedene Provinzen des russischen Reichs 2: 727, pl. R.
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