The largest species of tree is the coast redwood, scientifically known as Sequoiadendron giganteum. These majestic trees can grow over 300 feet tall and have a trunk diameter of over 30 feet. Coast redwoods are primarily found in the coastal regions of northern California. They thrive in moist, foggy conditions, which contribute to their impressive size. Their durability and resistance to pests and diseases allow them to live for thousands of years, with some specimens believed to be over 2,000 years old. Coast redwoods play a crucial role in their ecosystem, providing habitats for numerous species.