When the ice finally lets go of White Rock Lake, Jefferson turns green almost overnight and the mowers come back out of the shed. R & R Lawn Maintenance runs the neighborhoods off Espanong Road and the hills stacked above them, cutting on a weekly beat straight through the warm stretch. Mowing, trimming, edging, walks blown clear; spring cleanups to start it and fall cleanups to shut it down. Highlands lawns grow in short bursts and thin patches, so steadiness does more for them than any single big push. By the middle of June a route through here looks like one long unbroken line of well-kept grass.