I have a clematis from PC super store and it is labeled as a Grade B only. Now that I will be re-planting it to a larger pot with lots of container drainage while situated on a pallet, I need to know what type of soil to use from the local supermarket. Unfortunately, I do not have transportation to a nursery. There is a small amount of white mold growing on the moss on top soil of the plant outdoors. Any suggestions about this as well are welcome.