A blue norther can knock twenty degrees off a San Antonio afternoon in an hour, and the January morning after one is all bright glass: sharp air, a hard blue sky, and mountain cedar pollen drifting in from the Hill Country like gold smoke. Deep winter and the hottest stretch of summer are the safest times to cut into the city's oaks, which makes these cold days a natural season for the work Canopy Tree Service does. Tree trimming and pruning, with lawn care for the ground beneath, look after the shade that counts most in a town where July sun lands like a weight. A live oak lifted off the roofline, a cedar elm thinned so light can reach the grass, and the canopy stays whole, only better balanced. When summer comes back around, that shade is the coolest room on the property.