Greenskeeper is a professional who looks after the golf course or the country club. They often work upon the instructions of a golf course superintendent. Their work includes cutting down of greens, trees and fairways, provide irrigation and fertilization facilities, explore pests and pesticides, trimming and arrange the flags and tee makers for tournament or daily plays. They also do non daily duties like aerating, rolling, topdressing and verticutting to maintain healthy turf. Though the work has no specified rules, it is virtually uttered by the rules of golf recognized by the US Golf Association. With the help of Stimpmeter green speaker can assess the speed of golf greens. He can enhance the speed of green golf through shorten the grass, cut it into multiple directions or by top-dress the green with fine sand. Horticulturists and ground keepers are somewhat similar to green keepers in their work, excluding setting pins and tee makers. This task makes distinction to greenskeepers from horticulturists and ground keepers.