Evening comes up the bluff at Fort Clifton with the river going pewter below and the last mowers of the day quieting one street at a time. Tri-City Lawn Service works those hours and every one before them, mowing, trimming and edging yards through Petersburg and the towns beside it. Grass grows on nobody's convenience here — a warm wet week in June takes a lawn from neat to shaggy in six days flat — so the schedule keeps its own steady beat. There is a plain pride in pulling away at dusk from a property cut level, edged straight and swept clean. Come autumn the leaves get carried off, and the ground goes into winter looking looked-after.