Hi, I was just getting readsy to plant out into a bigger pot, but I found my compost has got mould growing all over it. It has been sitting in the garage for a couple of months just with the bag cut open. It is cold and damp in there, but the compost is dry, it's sort of gone hard and is coverd if fur! It's organic stuff. Is this a problem? I don't know if I should use it or not....?