The coast redwood, the world's tallest tree, is one of the three sequoia tree species, together with the giant sequoia(Sequoiadendron giganteum) and the dawn redwood (Metasequoia glyptostroboides). The coast redwood (Sequoia sempervirens) grows in natural stands in a long, thin coastal area along the Pacific Ocean in the west and northwest of the US (mostly California). It is the tallest tree in the world.
With its relatively slender silhouette this tree can grow even 20 meters higher than the tallest giant sequoias, that are nevertheless the biggest trees in the world, when looking at the volume of the trunk. The tallest known living tree, named Hyperion, is 115.55 m or 379.1 feet (measured in 2006) tall! This gets close to 120 to 130 m, that, according to a 2004 biological study, is the maximum attainable height  of a tree.
Foggy coastal forests of the Pacific
During the whole year it rains quite a lot in this thin coastal strip and it is quite foggy most of the time. This way the tree can absorb enough water and does not suffer that much from evaporation stress. Most of the tallest trees can be found in the wet river valleys on fertile, alluvial deposits, although unexpectedly a couple of recently discovered record breaking trees appeared to grow on the valley slopes. The coast redwood forests have an abundant undergrowth (amongst which there are a lot of ferns). However, the biggest biodiversity can be found tens of meters up: differents species of plants, lichens, salamanders, ... live high up in the sky between the complex branch systems of the redwoods. Prof. Steve Sillett, who studies these redwood canopies, compares them with "hanging gardens".
sight, the needles of the coast redwood do not resemble those of the
giant sequoia: they are bigger and flat, much like that of a yew. The
crown is conical just like the one of the giant redwood, with an almost
equally massive trunk with a reddish brown, soft bark. The egg shaped
cones are smaller (2 to 3 cm). In contrast to most other conifers, the
coast redwood starts to grow again after being cut. The maximum age is
probably around 2500 years.