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I normally don't come to this forum on DG (I'm more of a perennial gardener, myself), but I'm posting a question here for my dad. He's planted 10 blueberry bushes and they're all pretty unhappy. He's been trying to lower his soil PH and says he can't seem to get it lower than about 6 despite adding sulfur and peat moss. (Unfortunately, he didn't amend the soil before he actually planted.)
I advised him to try pine needle mulch and working some pine needles into the soil. Beyond that, I don't know much about changing soil PH. Can anyone provide any other helpful tips?
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