Question: What kind of hose-end sprinkler is best for watering the grass?

Answer: You want one that puts the water out uniformly across the ground. It should have water droplets that are large enough that they won’t blow in normal breezes, yet it should water gently enough that it doesn’t wash. The old-fashioned circular models with adjustable side arms work well, and so will impact heads that are carefully adjusted to the proper spray patterns. Oscillating types that sweep back and forth are probably least effective. Their sprays are so high that wind can blow them astray, plus they put the water into very fine droplets, for greater loss to evaporation. They also clog easily.