Reducing Soil pH – Wisconsin Horticulture
If plants are already established, use a top-dress application limited to about 1 lb. (2 cups) aluminum sulfate or 1/6 lb. (1/3 cup) elemental sulfur per typical landscape plant. Lightly incorporate the aluminum sulfate or elemental sulfur into the soil, or water-in well. Repeat applications monthly until the total recommended amount of ...