feet in diameter. Its bark can grow up to 12 inches thick. The Giant Sequoia trees can live up to an astonishing 3,000 years, and have branches up to eight feet in diameter. Its bark can grow to an amazing thickness of three feet. Both trees have dark brown bark, and look very similar, but the Redwood thrives in coastal climate, while the Sequoia exists in more mountainous areas. In either case, they are a must-see California attraction.