Late June, and the air off the Hatfield Swamp lies thick over East Hanover by ten in the morning. Green Horizon Lawn and Plant Heath Care works in that green humidity — mowing, trimming, edging, cleanups, and the upkeep that keeps turf and plantings holding their own when the heat leans on them. Humidity feeds a lawn and it also feeds everything that troubles a lawn, which makes attention the entire trade. There's real reward in a yard that stays even and unbothered through a Morris County August while others go patchy. Then the cool nights of September arrive and it all comes roaring back.