These plants are bulbeous. The Allium giganteum has a panel-like development, therefore it tends to widen very much. This plant in the summer assumes a purple colouring; it is large in size and can reach 2 m high. It doesn’t keep its leaves in the winter.
Plant which need at least a few hours a day of solar light. During this time of year we shouldn’t worry about minimum temperatures, in fact the The Allium giganteum can bear temperatures a few degrees below zero.If you desire cleaning the ground from the bulbous plants after flowering, wait for the leaves to dry; later it’s possible to take the bulbs out of the ground and place them somewhere dark, cool and dry, until the best season to plant them again.