A variety of balloon flower cultivars are available, emphasizing different flower colors and shapes. ‘Astra double’ is a mini variety, growing less than a foot tall. The small flowers appear to be doubled, as there are 10 petals instead of the usual 5. ‘Astra Pink’ is another mini cultivar, but instead features 5 pink petals on each flower. ‘Fuji Blue’ grows to around two feet tall and produces deep blue flowers. The large size of this variety usually necessitates the use of staking.