The Highlands come to spring late — Wharton waits out a week or two that the flatlands east of here have already spent. Then it breaks all at once, and the borough turns green in about four days flat. Leprechaun Lawns, Inc. meets that turn with cleanups: winter sand raked out, matted leaves pulled from the fence corners, beds mulched while the ground is still soft, the first mow set high. After that comes the long steady middle — weekly mowing, edging and trimming, hedges held to their line — until October hands the color back and the leaves come off load after load. Green is the entire business, and this is fine ground for growing it.