August in San Diego runs hot and bright inland, where the San Diego River slips low and reed-lined through Mission Valley and the mesas above it soak up the sun. In a city that gets most of its rain in a few short winter months, a green lawn is a small act of faith, and Superior Irrigation & Landscape Co. tends that faith yard by yard. The work is lawn care in its plainest, most satisfying form: a fresh mow laid down in even passes, edges cut clean against sun-warmed concrete, borders trimmed back so the grass reads sharp and deliberate. By late afternoon, when the sea breeze finally pushes inland and shadows stretch across the mesa, a cared-for lawn looks almost cool to the touch. That is the pride of it, a patch of green holding its own against a San Diego summer.