The first blue norther of November hits Dallas like a door flung open, the temperature tumbling twenty degrees in an hour, the sky scrubbed hard and clear, pecans and post oaks letting go of their leaves at once. Along the winding lanes of Preston Hollow, where lawns run long under old trees, the morning after is all wind and color. Lambert Landscape Company handles lawn care and landscaping for exactly these turns of weather: clearing the drift of leaves before it smothers the grass, taking the final growth down to a neat height, putting beds in order for the cold. The aim is a yard that looks composed even when the season changes overnight. When the wind dies and the low sun slants across the grass, the work shows in every straight line.