Some plants require a ph(below 7.0) or they develop iron chlorosis. Examples: Azaleas, Blueberry Bushes, Rhododendrons. There are amendments that can make your soil ph more acidic such as a by product from coffee bean processing. Mix the product in with your soil. 5lb bag
Fertilizer Report Independent Testing by Midwest Laboritories
Total Nitrogen 2.42Potassium .53Sulfur .20Calcium 1.29Magnesium .22Sodium .02Copper 35Iron 296Manganese 123Zinc 28Moisture 94.12pH 4.80Total Carbon-44.59C/N Ratio 18.4:1