This tree, the only hemlock found in Ohio, is large, growing to a height of 60 to 75 feet and a diameter of 1 to 3 feet. In virgin forests it grew to more than 100 feet in height and 4 feet in diameter. The distinctive, flat needles are glossy green above, and pale green with two white lines below. The scaly bark of mature trees is dark purplish brown and deeply furrowed. The tree grows best in cool, moist locations such as the north-facing slopes of deep ravines in eastern Ohio. The wood is inferior to that of White Pine and is used for rough construction lumber, and as pulpwood. Formerly, the bark was much in demand for its tannic acid, used in tanning leather. Several birds and mammals feed on the seeds.