On the first warm Sunday of spring, Mission Bay Park becomes the city's front lawn: kites snap above the shoreline grass, picnickers stake out spots along the water, and the bay beyond is crowded with paddleboards and little sailboats. So much of San Diego life happens outdoors, on open green ground. For Landscapes Usa, that kind of ground is the whole point: landscaping and lawn care that keep grass healthy, level and ready for the people who use it, whether it is a sweeping lawn or a small backyard patch. A well-kept lawn has a way of inviting people to slow down, kick off their shoes and stay. Here, they stay until the sun sinks into the haze over the ocean and the bay turns the color of pewter.