We fertilize with Holly-tone, which is an organic fertilizer made specifically for acid-loving plants such as rhodies, azaleas, and blueberries. We mulch the bushes with sawdust which is also acidic but you can use shredded oak leaves or pine needles too. Be sure to test your soil to make sure you really need to lower the pH before you add any amendments such as sulfur or cottonseed meal.
I have never done this and it seems extreme, but you can also try watering with diluted vinegar - 2 Tablespoons per gallon of water. Here in the Northeast we struggle to raise the pH rather than lower it.
We fertilize with Holly-tone, which is an organic fertilizer made specifically for acid-loving plants such as rhodies, azaleas, and blueberries. We mulch the bushes with sawdust which is also acidic but you can use shredded oak leaves or pine needles too. Be sure to test your soil to make sure you really need to lower the pH before you add any amendments such as sulfur or cottonseed meal.
I have never done this and it seems extreme, but you can also try watering with diluted vinegar - 2 Tablespoons per gallon of water. Here in the Northeast we struggle to raise the pH rather than lower it.