Along Straits Pond the water changes color with the tide, and the lawns that face it get by on borrowed light and salt air. Lawn Love Lawn Care of Boston tends them right through the growing months — cutting on a schedule, keeping the edges trim, clearing leaves once the marsh grass has gone bronze at the far bank. Then the year turns and those same properties are plowed and shoveled, drives cut open all the way to pavement. Hull asks a great deal of a yard, sitting where it does between an ocean and a harbor. Meeting that ask, week after week, is the whole of the job.