Maples flower in the spring, either before or at the same time the leaves appear. Most maples bear male and female flowers on the same tree. Maple seeds, sometimes called keys, grow in pairs and have flat, thin wings that make them whirl and float in the wind as they fall. Breezes can carry the seeds far from the parent tree, thus helping maples spread to new areas. Maples are an important source of lumber.
Some species have very hard, strong wood.
Manufacturers use it to make furniture and musical instruments. The sap of certain maple species is used to make maple syrup. People also plant maples as shade trees. Fourteen species are native to North America. They grow mostly in the eastern half of the continent.