Maintaining a verdant lawn typically requires a lot of time, money, or both. With OtO Lawn, “all you need is a good-quality garden hose and a strong wi-fi connection,” says founder and CEO Ali Sabti.

As spring gets into swing, we welcome the return of warm weather, verdant lawns and blooming flowers—but sometimes Mother Nature needs some help and not every homeowner has a green thumb. Thankfully, ...