MORE than 15,000 pom-pom headed alliums have burst into flower at Arundel Castle as part of its annual Allium Extravaganza.

This year’s display, which comprises purple and white alliums, is the largest showcased at the castle and is expected to be in its full glory from mid May.

A firm favourite with the nation’s gardeners and nicknamed the “fireworks of gardening”, alliums can grow up to 5ft high and are part of the same family as onions, garlic and shallots.

This year’s display, which can be seen throughout the castle’s walled gardens, includes 14 different varieties including Allium Mont Blanc, a rounded bloom with white, star-shaped flowers and Allium White Cloud which boasts a white head containing hundreds of tiny white flowers. The most admired variety is the amethyst coloured Allium Christophii.