A gorgeous lawn is a key element of the American dream, since a lush, green, well-trimmed lawn makes your home look great. The mower you choose affects the health and beauty of your lawn, and directly impacts the amount of time and money you invest in lawn care.If you’ll be replacing an old lawn tractor this summer, or stepping up from a walk-behind to a riding model, you may be wondering about zero-turn mowers, what they do and if they’re worth the investment. Before you decide what type of mower to buy, here’s the “A to Z” facts about why millions of homeowners have chosen zero-turn mowers instead of lawn tractors:The “zero” in the mower name refers to their ability to turn in a very tight radius, unlike lawn tractors which need to make wider turns.