Have two blueberry plants in the ground now, one with a 25/25/50 mix of peat, bark and soil the other with a 35/35/30 of peat, bark and soil. I have heard from various sources that soil is not actually required for blueberries to grow and they can be planted into a moistened peat moss bed. I don't have the proper means to control my ph exactly at this point but am going to be adding small amounts of white vinegar over the weeks to see how the blueberries respond. The first is going to get a high concentration of white vinegar than the second as it has a more alkaline ph due to the higher soil concentrations as opposed to the second with a higher peat/bark mix. Keeping you updated on my garden and new tips and ideas as they come. Tip: Blueberries are like orchids and hydrangeas they like that acidic soil.