Sorry, I should have mentioned a way to clear moss, so what I do here in England is give the lawn a good spiking with a garden fork, pushing it in about 4inches all over the lawn, after raking out the moss and then a covering of sand which is then brushed into the holes left by the fork to provide drainage. I also gently lift the grass a little before pulling the fork out , this helps the soil to breath Hard work, but if you want to rid yourself of moss this is what to do every year until it`s all gone. If you have a lot of moss, use it to edge your hanging baskets.