Okay, this is something you really don’t NEED. If you mix greens and browns and add water+time, you will get compost. However, if you compost a lot, you might get impatient with the speed of your bin(s). I bought some compost maker which I am trying, but I am little concerned by lack of knowledge about the ingredients. In my quest for organic fertilizer suggestions, I stumbled upon alfalfa meal as a suggested compost stimulator. Will give it a try once I locate a local source!