First: they heat up very quickly when pilled up using a lot of nitrogen while decomposing and thus starving the soil, second: they tend to form an unpenetrable layer preventing moisture to get through them. It is best to pile them up somewhere in a corner and leave them for a few weeks to decompose and then you can use them mixed with coarser material. I shred most of my garden prunnings, woody and soft and mix it up with grass clippings. After 4 weeks I usually have nice compost.

and third and maybe foremost they contain seeds from all sorts of weeds including the grass itself, whatever passes through birds, gets carried in by animals including the human ones and whatever blows in. if you spread it as mulch it should be covered to supress the growth of weeds, nut grass just loves germinating in grass clipping mulch seen it too many times.

the best place for grass clippings is on the lawn it will feed the lawn and minimise the ned to waste water on this wasteful folly.

len

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I put my grass clippings in the chook pen to be scratched around for a couple of weeks and then put it in the compost pile.