The Parallels Between the Longest-Lived Tree and the Longest-Lived Human
The Giant Sequoia tree has protective chemical compounds called tannins that are concentrated in both the bark and heartwood or the inner, non-living core of the tree. Tannins are distinguished by their deep reddish-brown color. These tannins act as a potent, natural defense mechanism against fire, insects, and fungal decay, allowing the tree to live for thousands of years. In contrast, other trees do not have this high tannin concentration in their bark and heartwood.