At the very end of the article, talking about finding/using a control for the study: "The only place I could grow grass in the conterminous U.S. were a few areas in the northeast and the great plains. Everywhere else lawns have to be coddled to keep them growing and to keep weeds and other plants from taking over." But, perhaps the author's definition of lawn is different than mine. I'm content to have a mix of grasses and what some consider weeds. I like the bright spangle of dandelions, the bees love the clover, and I've also added spring crocus and English daisies for more color.
