The Whippany runs low and brown under the footbridges by midsummer, and the day's heat is already waiting at seven in the morning. That is when SIVAR LANDSCAPING SERVICES LLC prefers to be working Morristown yards — mowers down early, dew still on the blades, the sound moving from one property to the next along the streets that shadow Patriots' Path. Grass cut before the sun gets high takes the afternoon better, and it shows in August when other lawns have gone pale. The season's other work fills in around it: beds edged and mulched in spring, hedges of leaves cleared in November, the yard handed over each week looking deliberate. Nothing dramatic, just a place kept the way its owners would keep it if they had the morning free.