We had two pine trees right near our house in a flower bed get totally mauled by our ice storm a year ago. We had them cut down and stumps ground. We tried planting some flowers where the ground stumps were. However, the ground up pine stumps/roots are in the soil and nothing much will grow. Is there anything I can add to the soil to help get the stump particles to decompose and/or add nutrients and/or get the soil ph back to something where plants can grow????