Wheat is a grain (a plant that produces a dry edible seed called a kernel) used mostly for human consumption. Wheat is an annual grass plant that will grow 2 to 3 feet tall.There are two major types of wheat planted in the United States.They are winter wheat and spring wheat.hresh: to beat the stems and husks of grain or cereal plants with a machine to separate the grains and seeds. Tiller: an erect shoot arising from the crown of a grass. Wheat germ: the embryo of the wheat kernel that will develop into a wheat plant.