Leaf Color Range On the tip of each leaf lobe is a long bristle or "pin" that gives the tree its name. It's a very popular shade tree (also called the swamp oak) with an almost oval silhouette. The acorns produced by the tree tend to take root easily since they don't have to penetrate layers of leaf litter to germinate. Once planted throughout the city, it is rarely planted today because of its high maintenance. Height: 50'-90'. The lowest branches droop; the middle ones grow horizontally; the top ones point upward. Leaves: 3"-6" long; almost as wide. Alternate simple. Lustrous dark green above, lighter green beneath with tufts of hair. Habitat: In Pittsburgh, pin oaks are well suited to the region's acidic soil. Also found in wet, poorly drained areas, often in pure stands as well as in parks and gardens throughout the eastern United States.