Picea sitchensis, the Sitka spruce, is a large coniferous evergreen tree growing to almost 100 m (330 ft) tall, and with a trunk diameter at breast height that can exceed 5 m (16 ft) (see List of superlative trees). It is by far the largest species of spruce and the fifth largest conifer in the world (behind giant sequoia, coast redwood, kauri and western redcedar); and the third tallest conifer species (after coast redwood and coast Douglas-fir).