FORMULATION: Aluminum Sulphate Helps create an acid soil condition for plants such as azaleas, gardenias, camellias, rhododendrons, blueberries and others. Intensifies blue color in hydrangeas. APPLICATION RATES: Shrubs - 1 lb per 3 ft of height Trees - 1 lb per inch of diameter To correct Alkaline soil - 5 lbs per 100 sq ft.