Lawn moss is a common problem. Moss thrives in damp, shady lawns where the soil is acidic and drainage is poor. Hose 'n Go Moss Out! For Lawns is the fast, easy way to kill moss in lawns. Once moss is gone, the grass is free to grow and thrive. This easy-to-use ready-to-spray container attaches right to your garden hose, so there is no mixing! The moss in your lawn will turn black and die within hours. The grass will gradually fill in thin and bare spots.