Espoma Compost Starter is the ideal choice to help make rich, fertile compost œ nature's original soil conditioner. Espoma Organic Compost Starter is formulated to accelerate the process of home composting materials including manure, grass, leaves and food waste. Compost Starter contains billions of microbes specially cultured to speed the decomposition of difficult to compost organic matter. These are combined with the proper energy sources and pH balancers to assure composting success.