We are composting on site! The blackberry canes and other invasive materials are piled up on a platform and then allowed to compost. As soon as the area is stabilized and the material in the piles has dried and begun to rot, we can break the piles down and allow them to rot back into soil. Usually the piles are down to about a third of the original size after the first year and a third again the next year. This saves Seattle Parks alot of money and time and we will ultimately get good soil from the rotted material.