A Saturday morning in the neighborhoods off South Street sounds like Shrewsbury in late spring: one mower, then another, then the whole street. Lawn Boyz Landscaping is somewhere in that chorus, working cul-de-sac to cul-de-sac with mowing, trimming and edging, blowing the clippings off the pavement before moving on. A cut lawn is a small promise kept, and it keeps every week, which is why the schedule matters more than anything fancy. A cleanup starts the season, the leaves finish it, and the summer between belongs entirely to the grass. It is uncomplicated work in a town that appreciates it.