The ground from the pinelands edge to the river mouth runs sandy and acid, quick to drain and quick to welcome whatever seed blows in on the wind. Letson Weed Control reads a Toms River lawn for exactly that — crabgrass along a hot curb strip, broadleaf creeping into the places turf thinned out over a dry July. Treatments go down timed to the season, backed by the ordinary care that keeps grass thick enough to hold its own ground. A weed-free yard is no accident here; it is a calendar kept and a slow walk taken across the property. What comes of it is uniform green from the street to the back fence, which is all most people ever wanted.