Spring in the Mohawk Valley arrives as mud well before it arrives as green. Along the road cuts and new lots on the slopes above the river, bare ground sits waiting for something to hold it, and that is where American Hydroseed LLC goes to work — hydroseeding, new lawn seeding, and the lawn care that follows once the seed takes hold. The first faint haze of green over a sprayed bank is one of the better sights in Montgomery County: barely there one week, solid the next. By midsummer a slope that was raw dirt in April mows like it had always been a lawn. Turning bare ground into turf is a slow trick, and it does not get old.