July on the Forest Street rise is all cicada noise and hard afternoon light, with lawns that go from lush to thirsty inside a single week. This Osorio Landscaping and Tree Services crew keeps them even — mowing on schedule, trimming along walls and fences, edging drives and paths, mulching beds, and clearing a yard top to bottom in spring and fall. Cutting a little higher in the heat is the sort of small decision that shows up two weeks later. The compliment worth having is a lawn nobody has to think about. Lawn care in Waltham, Belmont, Watertown and Newton.