Aluminum Sulfate

Helps create an acid soil condition for plants. Intensifies Blue color in Hydrangeas.    Use on Azaleas, Gardenias, Camellias, Rhododendrons, Blueberries and others listed on label.

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.