The time it takes to create fertilizer that you can actually use is one disadvantage of composting. In order for the compost to be successful, you need to give the food and other material in compost bin at least a month to decay into something usable. In addition, during cold weather, it takes even longer for the material to break down.
Read more : http://www.ehow.com/list_7019360_disadvantages-composting.html