Allium or ornamental Allium is a perennial plant that grows relatively easily. Native to Europe and Asia, allium belongs to the same genera as edible garlic, onion, shallot, and chives. It is also part of the same family as the leek. All of the different species of allium produce beautiful flowers grouped in balls, but their sizes and colors vary by variety. This decorative plant is mainly used as a bed or border, but it is also used in bouquets.