Lawns in the United States

In a 2005 NASA-sponsored study, it was estimated that the area covered by lawns in the United States to be about 128,000 square kilometres (49,000 sq mi), making it the nation's largest irrigated crop by area.[1] Lawn care is thus a popular business in the United States; proper maintenance, construction and management of lawns of various kinds being the focus of much of the modern horticulture industry. Estimates of the amount spent on professional lawn care services vary, but a Harris Survey put the total at $28.9 billion in 2002 (approximately $1,200 per household using such services).

Lawn grass zones of the U.S.

In her book The Lawn: A History of an American Obsession (1994) Virginia Scott Jenkins traces the historic desire to kill weeds. She notes that the current rage for a chemically dependent lawn emerged after World War II and argues that "American front lawns are a symbol of man's control of, or superiority over, his environment."

According to the EPA, "of the 26 billion gallons of water consumed daily in the United States, approximately 7.8 billion gallons, or 30 percent, is devoted to outdoor uses. The majority of this is used for irrigation."[2]

Along with trees, lawns are a vital element in the fight against urban heat islanding. Lawns provide:

• Oxygen conversion,
• Filtering of air particulates,
• Erosion control,
• Air and surface cooling to offset asphalt, cement, and rooftops,
• A place for recreation and enjoyment.

In comparison to bare dirt, a lawn may be 20 °F cooler on a hot day, and up to 40 °F cooler than cement surfaces.

“What if each American landowner made it a goal to convert half of his or her lawn to productive native plant communities? Even moderate success could collectively restore some semblance of ecosystem function to more than twenty million acres of what is now ecological wasteland. How big is twenty million acres? It’s bigger than the combined areas of the Everglades, Yellowstone, Yosemite, Grand Teton, Canyonlands, Mount Rainier, North Cascades, Badlands, Olympic, Sequoia, Grand Canyon, Denali, and the Great Smoky Mountains National Parks. If we restore the ecosystem function of these twenty million acres, we can create this country’s largest park system. It gives me the shivers just to write about it. Because so much of this park will be created at our homes, I suggest we call it Homegrown National Park.”

— Nature's Best Hope: A New Approach to Conservation That Starts in Your Yard by Douglas W. Tallamy

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