Aeoniums are monocarpic plants, meaning they die after they flower. In general, most Aeonium varieties last 5-6 years, which is how long it takes for them to mature. Essentially, each Aeonium comes with a timer. Once it matures, it will flower and then die. Some Aeoniums have multiple branches with many rosettes, and each rosette dies individually. They have a larger lifespan than their cousins with solitary rosettes.