Manure

If you can get it, animal manure from animals like cows, horses and sheep are great soil conditioners. It's best to use manure that is more than six months old. New or fresh manure might hurt your plants because it is too fresh or has not aged. Also, if you have a pet at home, don't use that manure for the garden! There are things in it that are not safe especially around vegetables that you pick and eat.