Grow Your Soil™ service was excellent and provided prompt replies to all my questions. Their recommendations to improve boron and magnesium deficiencies in my soil were very helpful, and they insightfully determined the reason for my high level of phosphorus in my soil, which was due to my using waterlogged soil from a nearby spring as one of the ingredients in my compost pile. His detection work and willingness to help beyond simply recommending fertilizers was extremely valuable.