Allium azureum (Ornamental Onion) flowers are the gardener's holy grail, and this Siberian native provides them in abundance. Allium azure, also known as Ornamental Onion, is easily grown and decorates the garden with plenty of 1 1/2" round flax-blue flowers. Re-seeds readily. Plant with bright yellow flowers like Golden Spur Columbine. May-June blooming. 18" tall.