Not surprisingly, giant sequoias are fast growing trees, averaging approximately 2 feet per year in height. The growth rings of this young tree are testament to the rapid diameter growth of the trees as well. In general, a giant sequoia will grow rapidly until it attains a height of about 200 feet. At this point vertical growth begins to slow or even stop, but growth of the trunk continues. In a single year a tree like the General Sherman adds enough wood in the form of diameter growth to be equivalent to a tree a foot and a half in diameter and 60 feet tall.