Also known as Carya—Hickory trees grow 2 feet per year and grow up to 60-80 feet tall, because of their slow growth rates their wood is often hard and dense. There are 5 different species of Hickory that grow in Pennsylvania. These trees are strong and robust shade trees that often grow in moist grounds near streams and rivers. The bark of these trees is generally grey that darkens with age and is rough with furrows and ridges running vertically up the trunk. The leaves are long and narrow and are made up of several leaflets growing oppositely of the stem. Typically, Hickory lumber is made into flooring, cabinetry, tool handles, railroad ties, and pallet material.