I know the benefits of mulching and have been doing it for the last 4 years with my Deere JS63 mulching mowers. This spring quite a number of my yards seem to have flattened, matted areas. I power raked some of the yards (those that wanted it) and left some others. It seems like there was a buildup of thatch. It's standard cool season blue grass. During the summer you the mowers are giving a really clean cut...you can't see any of the clippings (so I'm assuming they are mulched fine enough). This is the first time I've noticed the matting. Any ideas? The only other thing is that the same matting occurred on a yard that we always bag (by customer request). We had a long winter here with quite a bit of snow and ice, no mid-season melt like we usually get. Also last summer was brutally dry and my thrifty customers can't be bothered to water. I'm wondering if the climatic conditions have more to do with it. I'd appreciate any ideas and I'll try to get some pics. One of the yards is just brutal and looks absolutely awful. I need to get it back into shape.