Midsummer in Hyde Park smells like cut grass and warm pine drifting out of Stony Brook Reservation. JNJ Crew Landscaping & Tree service keeps the lawns along those Boston streets on a weekly rhythm — mowing, string trimming around posts and stone, edging where turf meets asphalt, mulching to keep the beds honest through August. Shade from big old trees makes for thin grass, so overseeding and feeding get planned rather than guessed at. In November the leaves come down all at once and get cleared before they turn to mat. It is the sort of yard where a hose, a chair and an even lawn make a whole evening.