PLANT MERISTEMS. “This structure allows perennial plants to explore the environment vertically in the search for light, and enables some of them to be very large and to have a very long life span. Some trees such as sequoias and pines, among others, can grow up to 100 m in height and survive for centuries and even millennia.”
http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2010.03360.x/full