The Merrimack laid down the ground most of Concord grows on — the low river flats out past Sewalls Falls, dark and easy and quick to green. Down to Earth Lawn Care starts there, with what is actually under the grass, because a lawn on sandy upland and a lawn on river loam want different things from you. Mowing, edging and seasonal cleanups follow the ground rather than the calendar. When the valley fills with snow, the same trucks come back with plows and open the drives before the commute. It is one property, watched all the way around the year, by people who know which end of it drains.