Texans call the silver-leafed cenizo a barometer bush, because a few days after a good soaking it bursts into purple bloom as if it had waited all summer to be asked. Texas Sage Landscaping & Lawn shares its name with that plant, and lawn care in Dallas runs on the same kind of timing. In Oak Cliff, where the streets climb onto bluffs and the downtown skyline shows between the trees, a September rain wakes a tired yard fast, and a measured round of mowing, trimming and edging gets it back in shape before the fall flush runs ahead. There is something hopeful about that season here: the heat finally loosening its grip, dusk arriving a few minutes sooner each night, the grass green once more. A lawn kept through it carries that relief all the way out to the street.