Question: We have a lot of bark mulch in our landscaping. Would we need to rake the bark back, apply your soil products and then rake bark back around plants? Answer: Ideally, John and Bob's GrowGreen products would be applied before bark mulch was added, but that's not essential. The goal is to get the product into the soil and, since it is water-soluble, that will happen eventually whether it is applied under or over the bark. A major appeal of this product line is that you can continue to improve your soil on an ongoing basis without a lot of hassle.