About Allium caeruleum Pall.
Allium caeruleum, commonly known as blue globe onion, blue ornamental onion, blue-of-the-heavens, or blue-flowered garlic, has the scientific synonym Allium azureum Ledeb. It is an ornamental bulbous plant belonging to the onion genus Allium. This species is native to Central Asia, including Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, the Xinjiang region, and Siberia. In its native range, it grows on dry slopes, plains, and steppes. It is mentioned in Charles Antoine Lemaire’s works Flore des Serres et des Jardins de l'Europe and L'illustration horticole. Allium caeruleum grows up to 80 cm (31 inches) tall, and produces strap-shaped leaves and small globe-shaped umbels of blue flowers in early summer. These one-inch wide globular flower heads attract butterflies. In 1993, the plant was awarded the Award of Garden Merit by the British Royal Horticultural Society. A. caeruleum grows best in well-drained soil with full to partial sun. It is deer-resistant and suited for USDA hardiness zones 4–8.
