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It depends what the soil pH is now. If it is high you may have to add it as directed on the label (you can add too much and kill the plants) every few months to slowly bring the pH down to 5 or 5.5 and then continue to add it a couple of times a year to keep it down. If your pH is low you probably don't have to do anything. Mulching with pine needles or peat moss will help too.
Have you tested the soil? Why do you think you need to adjust the pH?
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