mower was used to craft modern-style sporting ovals, playing fields, pitches and grass courts for the nascent sports of football, lawn bowls, lawn tennis and others. The rise of Suburbanisation in the interwar period was heavily influenced by the garden city movement of Ebenezer Howard and the creation of the first garden suburbs at the turn of the 20th century. The garden suburb, developed through the efforts of social reformer Henrietta Barnett and her husband, exemplified the incorporation of the well manicured lawn into suburban life. Suburbs dramatically increased in size. Harrow Weald went from just 1,500 to over 10,000 while Pinner jumped from 3,00 to over 20,000. During the 1930s, over 4 million new suburban houses were built and the 'suburban revolution' had made England the most heavily suburbanized country in the world by a considerable margin. Lawns began to proliferate in America from the 1870s onwards. As more plants were introduced from Europe, lawns became smaller as they were filled with flower beds, perennials, sculptures, and water features. Eventually the wealthy began to move away from the cities into new suburban communities. In 1856, an architectural book was published to accompany the development of the new suburbia that placed importance on the availability of a grassy space for children to play on and a space to grow fruits and vegetables that further imbued the lawn with cultural importance. Lawns began making more appearances in development plans, magazine articles, and catalogs. The lawn became less associated with being a status symbol, instead giving way to a landscape aesthetic. Improvements in the lawn mower and water supply enabled the spread of lawn culture from the Northeast to the South where the grass grew more poorly. This in combination with setback rules which required all homes to have a 30-foot gap between the structure and the sidewalk meant that the lawn had found a specific place in suburbia. The chemical boom After World War II, a surplus of synthetic nitrogen in the United States led to chemical firms such as DuPont seeking to expand the market for fertilizers. The suburban lawn offered an opportunity to market fertilizers, previously only used by farmers, to homeowners. In 1955, DuPont released Uramite, a slow-release nitrogen fertilizer specifically marketed for lawns. The trend continued throughout the 1960s, with chemical firms such as DuPont and Monsanto utilizing television advertising and other forms of advertisement to market