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Allium x 'Cobalt Millenium', commonly known as 'Cobalt Millenium' flowering onion or ornamental onion, is a compact, patented hybrid perennial and a unique sport of the popular 'Millenium' cultivar, featuring dense clumps of strappy, blue-green foliage that remains attractive and lush throughout the season. In mid- to late summer, it produces large, globe-shaped flower heads of rosy-pink to lavender-pink florets on sturdy stems, creating vibrant, spherical blooms that last for an extended period and draw in bees, butterflies, and other pollinators. The foliage is glossy and somewhat onion-scented when crushed, adding subtle fragrance and texture while providing a neat, architectural base for the showy flowers. This low-maintenance, deer- and rabbit-resistant plant thrives in full sun with well-drained soil, tolerating average to dry conditions once established, and is hardy in zones 4-8. It excels in borders, rock gardens, containers, pollinator plantings, or massed displays, offering long seasonal interest with its bold blooms and tidy habit in sunny perennial gardens.
ORIGIN - Not US native
EXPOSURE PREFERENCE - Full sun, tolerates am shade
FLOWER COLOR - purple
HEIGHT - 12-18"
HABIT - evergreen
MOISTURE - moist/well drained
HARDINESS ZONES - 5-8
Allium x 'Cobalt Millenium', commonly known as 'Cobalt Millenium' flowering onion or ornamental onion, is a compact, patented hybrid perennial and a unique sport of the popular 'Millenium' cultivar, featuring dense clumps of strappy, blue-green foliage that remains attractive and lush throughout the season. In mid- to late summer, it produces large, globe-shaped flower heads of rosy-pink to lavender-pink florets on sturdy stems, creating vibrant, spherical blooms that last for an extended period and draw in bees, butterflies, and other pollinators. The foliage is glossy and somewhat onion-scented when crushed, adding subtle fragrance and texture while providing a neat, architectural base for the showy flowers. This low-maintenance, deer- and rabbit-resistant plant thrives in full sun with well-drained soil, tolerating average to dry conditions once established, and is hardy in zones 4-8. It excels in borders, rock gardens, containers, pollinator plantings, or massed displays, offering long seasonal interest with its bold blooms and tidy habit in sunny perennial gardens.
ORIGIN - Not US native
EXPOSURE PREFERENCE - Full sun, tolerates am shade
FLOWER COLOR - purple
HEIGHT - 12-18"
HABIT - evergreen
MOISTURE - moist/well drained
HARDINESS ZONES - 5-8
