Allium ‘Mont Blanc’ is a striking ornamental onion prized for its large, pure white, globe-shaped flower heads that bloom in late spring to early summer, typically May to June. The tall, sturdy stems rise above slender, strap-like leaves, creating an elegant architectural feature in borders, rock gardens, and mixed perennial beds. Thriving in full sun to partial shade with well-drained soil, ‘Mont Blanc’ is drought-tolerant once established and requires minimal maintenance. It attracts pollinators such as bees and butterflies, contributing to garden biodiversity. Though not native to the UK, this cultivar is valued for its dramatic floral display, ease of growth, and reliable performance, making it a popular choice for gardeners seeking a bold and sophisticated addition to their spring garden.