What was stegosaurus food source?

Stegosaurus was an herbivore, or plant eater. They probably ate mosses, ferns, horsetails, cycads and conifers. They could only reach plants that were within about 3 feet of the ground, unless they were capable of rearing on their hind legs. A study of the bite force and teeth of Stegosaurus suggests that they couldn't bite through sticks that were more than 1.2 centimeters thick, so they would have needed to eat very tender vegetation.