Allium caeruleum (syn. azureum) is one of the few blue alliums and is a stunning sky blue colour. When opened a lovely ball effect is given by the flower head. Alliums are superb for bees and butterflies and will naturalise very well in most soils that are well drained. Feed with bone meal or similar during the leaf and flowering stage to ensure future good growth and performance. Alliums perform very well with early flowering perennials.