There is a moment after the last pass of the mower when a lawn simply settles — the rows lying parallel and even, the grass standing at one clean height, the edge along the walk cut sharp enough to catch the low Pioneer Valley light. That is the work The Green Team Landscaping tends across Springfield, in the yards that step down toward the Connecticut River and the shaded blocks near Forest Park. They keep lawns through the long green stretch of a western Massachusetts summer, mowing and trimming and clearing the season's fallen leaves so a yard holds its shape from the first thaw to the last warm week. It is unshowy care, measured in straight lines and tidy borders — the kind that lets a house sit easily on its patch of the valley floor.