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yep, using raw horse manure is too hot for Tomato plants and you run the risk of killing most everything depending on how "fresh" the manure is. Horses pass on a lot of what they eat and if the hay...

The compost should be fine for a garden after two years. Depending on the feed used for the horses would be my only concern. As long as the hay fed did not have the chemical in weed & feed's you...