I am not an expert on Blueberry But I have dozen plants which were not doing any good. I was told by the extension people to check my soil PH. My soil PH was around 6.5 to 7. They told be that level is too high for Blueberry and the roots do not absorb any nutrients from the ground. They suggested on me to add sulfur. Since I added Sulfur and in about 5 weeks I have very healthy growing plants. If you try it it may work for you it might not I have no idea.