Grass on the Palmer Divide is thirsty in a way flatland grass never learns. The air is thin and dry, the sun at seven thousand feet has an edge to it, and a late-May afternoon can pull the color out of a lawn between lunch and supper. Rain Zone Sprinklers works with that fact rather than around it, mowing at a height the turf can actually hold, trimming and edging so the borders stay sharp without scalping them. Cleanups in spring and fall clear the mat of needles and thatch that keeps water from ever reaching the roots. When a Monument lawn comes in deep green through the dry weeks, that is not luck — that is somebody paying attention. Monument, Woodmoor and Gleneagle are the regular rounds.