Hi-Yield Aluminum Sulfate 4 lb granular Aluminum 0.10% Sulphur 14.40% Ideal For Use On Azaleas, Camellias, Rhododendrons, Gardenias, Holly, Etc. Maintains Or Changes Color Of White Or Pink Hydrangeas to Blue Helps Create An Acid Soil Condition Helps create an acid soil condition for plants such as azaleas, gardenias, camellias, rhododendrons, blueberries, hydrangeas, junipers, yews, cypress, caneberry, huckleberry, magnolia, oak, pine and others. Intensifies blue color in appropriate hydrangeas by making the soil acidic and ensuring that there is aluminum present in the soil. Used primarily to acidify soils. Helps create an acid soil condition (corrects excess alkalinity) which is desirable to the growth of certain type Plants, such as Azaleas, Rhododendrons, Camellias, Gardenias, Hydrangeas (Blue), Junipers, Yews, Cypress, Caneberry, Huckleberry, Magnolia, Oak, Pine and certain others. By acidifying the soil, this product can maintain or change the color of Hydrangea flowers. Blue Hydrangeas require Aluminum, as an acidifier, to retain their blue color. They should not be fed a Phosphate fertilizer due to the fact that it has a tendency to “tieup” Aluminum. Do not use on white or pink varieties unless a color change to blue is desired. Application Rates: 2 cups is approximately 1 lb. Shrubs: Use 1 lb. per 3 ft. of height. Mix 1 lb. in 5 gallons of water and apply at the drip line of the shrub. It can also be spread dry around the drip line and watered in. Trees: Use 1 lb. per inch of diameter. Mix in 5 gallons of water or apply dry at the drip line of the tree. To correct alkaline soil: Use 5 lbs. per 100 sq. ft. Wash off foliage and water in well after application. We will combine shipping whenever possible. If you would like to know the shipping charges before paying for your combined order, please choose the “Request Invoice” option during checkout (or “Commit To Buy” without actually paying). Shoot us an email if you need assistance. Thanks for visiting my store. We are here to help you with all of your gardening needs. Please email us with any questions or concerns.