'Serendipity' features blue-tinged foliage and was discovered as a sport of the hybrid ornamental onion Allium 'Millenium'. Globe-shaped inflorescences of purple flowers reaching 1.5-2" in diameter are held above the foliage on sturdy stems in mid to late summer. The flowers are suitable for fresh cut arrangements. Mature clumps will reach up to 1.75' tall and 1.5' wide.