The Living Catalogue › Allium 'Azureum' Allium 'Azureum' £1.30 Vivid compact cornflower blue flower heads . Height 60cm. Flowers June-July. 4/5cm bulbs supplied. Quantity: Add To Cart Added! Vivid compact cornflower blue flower heads . Height 60cm. Flowers June-July. 4/5cm bulbs supplied.