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I have some questions regarding acidifying soil. Last spring I planted several blueberry plants in a new bed. I added aluminum sulfate beforehand and at least a couple times during the growing season as my soil is alkaline. The plants did not grow much but they did not look unhealthy, either -- the leaves were green -- there just weren't very many leaves. Well I just checked the soil and the PH varies from 6.5 to about 7 in the bed. I am wondering if I should add a bunch of aluminum sulfate or give up on this bed for blueberries. I have read in a couple places that it is more effective to use a raised bed for plants that need an altered PH from what your soil naturally is. Why is that? What is it about a raised bed that would maintain acidity? Why is that different from a bed in the ground? And if I were to do a raised bed, and wanted to buy soil for it, is there particular soil I should get? Is some bagged soil acidic? Or would I be adding alum. sulfate regardless of what soil I use? Or should I just leave the blueberries where they are and try again to amend that soil?