Our love affair with a fresh-cut lawn is a relatively new
development. For much of history, people remained preoccupied with
avoiding starvation and plague. Foot traffic and grazing domestic
animals kept the area cleared directly around a home, but the rest
of the property was often used for gardening or left for wild plant
life. In much of the world, this is still very much the case.
But in the Western world, a well-kept yard has become the rave. The
invention of the manual reel mower in 1830 made it possible for
regular people to emulate the elegant grounds they saw surrounding
palaces and mansions. Today, lawns in the United States alone cover
a total of 25 million acres of land. (Source: How Stuff Works)