Answer: Such a steady supply of organic matter is excellent but unfortunately, it is not a good idea to use fresh horse manure on a garden because it will "burn" the plants. Ideally it would be aged for up to a year or composted prior to use. The composting process does not happen when temperatures are cold, so you will not be able to compost it over the winter. It would be better to dig it into the garden in the fall so it has ample time to break down before you begin planting, or possibly compost it during the summer and then when it is finished, use it as a soil amendment or mulching material. Once composted, you could certainly spread a layer several inches thick of compost at a time.
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