Out toward Bannockburn the lots open up — long lawns, horse fence, oak islands standing where a farm used to be — and mowing turns into something closer to landscape work. Perez Bros Landscaping & Design Inc. handles those acres and the tighter yards nearer Deerfield alike: mowing and trimming on schedule, edges cut clean along drives and walks, beds shaped and mulched, cleanups when the season turns. Late on a June morning the heat lifts off the grass and the whole place smells like a cut field. Design out here is mostly restraint — where the bed line runs, how the lawn meets the woods, what gets left alone. When it is right, the ground looks like it decided on itself.