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Giant sequoias grow in well-defined groves in California mixed evergreen forests, along with other old-growth species such as California incense-cedar ("Calocedrus decurrens"). Because most of the neighboring trees are also quite large, it can be difficult to appreciate the size of an individual giant sequoia. The largest giant sequoias are as tall as a 26-story building, and the width of their bases can exceed that of a city street. They grow at such a rate as to produce roughly of wood each year, approximately equal to the volume of a 50-foot-tall tree one foot in diameter. This makes them among the fastest growing organisms on Earth, in terms of annual increase in mass.