The Rouge is a modest river in Farmington, more a green seam through Shiawassee Park than anything grand, but it keeps the neighborhoods around it shaded and cool well into July. Birchwood Lawn & Landscaping LLC works those tree-heavy yards, where mowing means turning around old oaks and coming up to a bed of hostas without nicking one. Trimming, edging along the walks, keeping the beds clean, moving the clippings out — the ordinary list, done to the inch. Under a dense canopy a lawn shows every misstep, so care here is not a flourish, it is the requirement. By November the same lots are gold to the ankle, and the leaf work begins in earnest.