More of the earth's surface is covered by wheat than any other food crop. The leading wheat producing countries are China, the Soviet Union, the United States, India, and Canada. The world's farmers grow enough wheat every year to fill a freight train stretching around the world two and one-half times.
In the United States, the two major types of wheat grown are spring wheat and winter wheat. Spring wheat is mainly grown in the northern Great Plains states such as North Dakota, South Dakota, Montana, and Minnesota. Winter wheat is grown from the southern Great Plains states (Nebraska, Kansas, and Oklahoma) through the Eastern United States (Missouri, Illinois, Indiana, Ohio, Michigan, Pennsylvania, Virginia, North Carolina, South Carolina and Georgia). California has also become a winter wheat producing state.