July dusk in South Shores: the heat finally lets go, sprinklers tick somewhere down the block, and fireflies come up out of the grass near Greendell Park. Green Haven lawn care LLC works toward exactly that scene — a back yard cool and cut and worth sitting in when the day is over. Mowing, trimming, edging and the seasonal cleanups are the tools; a yard a family actually uses is the result. Shade under the big Decatur maples, full sun out along the fence, and the mowing adjusted for both. There is a particular quiet to a lawn that has just been finished, and it is the reason for the whole trade.