Derby is built where two rivers meet, and in July the valley holds its heat like a cupped hand — grass grows fast here, and it grows all week long. Connecticut Lawn Services & Landscaping keeps pace with it: weekly mowing, trimming around fences and foundations, edging the sidewalk lines, mulch in the beds, and cleanups at either end of the season. Seen from the greenway along the water, the lawns above the bank read as a row of green rectangles, and there is a plain pride in the ones cut straight. Small city, tight lots, plenty of corners — the work lives in details nobody notices until they go wrong. By late October the maples along the river let go inside a week, and the blowers get their turn.