The homesteaders who settled on the Great Plains in the 1860s faced numerous challenges to successful farming. Their iron plows from the eastern U.S. broke against the thick roots of the native prairie grass. Crops like maize and wheat did not grow well in the dry, hot climate of the Plains. Lack of water for irrigation and annual rainfall of only 38cm made crop growth difficult. Other problems included trampling of crops by cattle and buffalo, fires that destroyed dry crops and grasslands, plagues of grasshoppers that consumed entire harvests, homestead plots that were too small at 160 acres to support a family, and extreme variations in temperature and storms.