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The manure is good. Wood chips not so good. If it's mixed with straw even better. Horse dung was all I could get hold of for many years. I used it with great results. If there is a down side it's that quite a few weed seeds pass through a horse and end up on your plot. OK if you keep on top of them. All the dung I got was fresh so I let it stand for at least 6 months. It heats up pretty well so no doubt many seeds in it are killed off anyway. Don't be put off using it. If it's for free, get all you can.
Lauren - you are a mine of useful information. Who do you think worked out how much a horse poos!Old Bird ;D