It's Big. Planting a Giant Sequoia completes our full flush of redwoods: the Sequoiadendron giganteum is the most massive tree in the world and can live to be 3000 years old. Danny, one of our work-study students, and Dawn, one of our gardeners, planted the the big tree sequoia in the lower part of the Coast Redwood grove. The Coast Redwood, Sequoia sempervirens, is the tallest tree in the world. Our grove was planted by the Blakes in the early 1920s. Some of the Coast Redwoods came from their former residence in the area that is now the site of the stadium on the U.C. Campus. Below the new big tree redwoods are three Dawn Redwoods, the Metasequoia gliptrostroboides. The Dawn Redwood is native to China and was thought to be extinct for millions of years; they are deciduous and were planted sometime between 1922 and 1959. This new Giant Sequoia was graciously donated to the garden by a neighbor.