Grass has a harder job in the Sussex County highlands than it does down in the valley. The soil sits thin over old rock, the oaks and hemlocks throw long shade across the afternoon, and a lawn in Highland Lakes has to be coaxed rather than commanded. Burton Turf & Tree takes that as the interesting part — feeding and overseeding the tired shaded patches, cutting at a height that lets roots hold on through August, shaping shrub lines so light can reach the ground again. By the end of summer the difference shows in color: even green where there used to be bare, dusty ground. Lawn maintenance up here is patience with a schedule attached.