Long before the roller coasters at Six Flags start clattering and the lots around the stadiums fill, Arlington's sprinklers do their work in the dark. In the small hours of a summer night, before the sun climbs over Johnson Creek and the Entertainment District, irrigation heads rise from the turf, throw their arcs across the grass and sink back out of sight. Preferred Landscape & Irrigation works on both what you see and what lies beneath: landscaping above ground and irrigation systems below it. Pipe laid with care, heads set at the right height, each zone matched to the shade or sun it gets: that is how an Arlington lawn rides out the heat. When morning comes and the city roars back to life, the grass is already damp and cool, and nobody has to think about how it got that way.