Acid Special 17-6-6 helps to reduce soil pH which allows your plants to better utilize iron and other trace elements for overall plant growth. Perfect for greening up all acid loving garden and houseplants including: Azaleas, camellias, rhododendrons, hydrangeas, blueberries and citrus. Acid Special is best used as a root drench–especially for plantings next to concrete foundations of the home or other areas where soil pH may be elevated. This product will promote lush vegetative growth and better blooms through its enhanced nutrient package, which includes elevated levels of iron and sulfur. Azaleas, camellias, rhododendrons, pin oaks, holly, hydrangea (blue), magnolias, white and yellow pine, spruce, cedar, birch, blueberry.