Norway maple (Acer platanoides) is the ultimate shade tree, forming a dense crown thanks to leaves that grow up to 7 inches across. In fall, leaves shift to hues of yellow and gold. Give it plenty of space, because it spreads up to 50 feet. The form of this maple is a classic lollipop shape—a strong, straight trunk topped with a rounded leaf canopy. Norway maple tolerates urban conditions, but avoid planting it near driveways or sidewalks, because shallow roots can lift concrete. Trees grow 50 to 60 feet tall and 40 to 50 feet wide. Hardy in Zones 4-7.