<h2>Putting Greens</h2><p>To putt means to play a stroke, usually, but not always on the green, where the ball does not leave the ground. Once on the green, the ball is putted (struck with a flat faced club which makes the ball roll along the ground) towards the hole until the ball comes to rest in the cup. The grass of the putting green (or more commonly the green) is cut very short so that a ball can roll easily over distances of several yards. The direction of growth of individual blades of grass often affects the roll of a golf ball and is called the grain. The slope of the green, called the break, also affects the roll of the ball. The cup is always found within the green (at least ten feet from the edge), and must have a diameter of 108 mm (4.25 in.) and a depth of at least 100 mm (3.94 in.). Its position on the green is not static and may be changed from day to day. The cup usually has a flag on a pole positioned in it so that it may be seen from some distance, but not necessarily from the tee. This flag and pole combination is often called the pin.</p><p>Putting greens are not of all the same quality. Generally, the finest quality greens are well kept so that a ball will roll smoothly over the closely mowed grass. Golfers describe a green as being "fast" if a light stroke of the ball allows it to roll a long distance. Conversely, a green is termed "slow" if a stronger stroke is required to roll the ball the required distance.</p>
