Columbian Square holds onto its center-of-town feel — the storefronts, the crossing traffic, the small strips of green that people register without quite noticing. Dino Landscape Design works the lawns around South Weymouth with that in mind, since a yard is the part of a house everyone reads first. The routine is mowing and string trimming, edging along walks and drives, and cleanups at both ends of the growing year. August around here can turn dry and hard, so the craft is patience: cutting high, keeping blades sharp, letting the turf hold its color instead of forcing it. What comes of that is a lawn that reads calm from the sidewalk.