Bonide Aluminum Sulfate

Bonide Aluminum Sulfate

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Product Overview

Bonide Aluminum Sulfate lowers soil pH for acid loving plants like azaleas, camellias, gardenias, hemlock, holly, cedar, blueberry, rhododendron, and dogwood. Bonide Aluminum Sulfate turns hydrangeas blue. Includes easy to follow chart. Bonide Aluminum Sulfate works in all soil types.

Features and Specs

Active Ingredient aluminum sulfate 100%
For use in Azaleas, Camellias, Rhododendrons, Gardenias, Holly, Cedar, Blueberry, Dogwoods, and other acid-loving plants
Application Test soil to find the pH to determine the amount to be applied
* See label for complete application instructions
Pet safe Yes, if used as directed on Label
Special Features Turn Hydrangeas Blue
Shipping Weight 4.08 lbs
Manufacturer Bonide (Mfg. Number: 705)
UPC 037321007050



A soil test is the best way to determine the garden’s need for Garden Rich Aluminum Sulfate. A pH above 7.0 indicates alkalinity. The chart below indicates the amount of this needed to lower soil pH to 5.0, a suitable pH for many garden plants that thrive in acidic environments. Do not exceed the recommended amount of this. Lowering the pH too much can result in nutrient deficiencies and possible aluminum toxicity. If the pH becomes too low, it can be raised quickly with Hydrated Lime. For best results, soil should be well drained. Following application, wash off foliate and water thoroughly.


In established gardens, Garden Rich Aluminum Sulfate is best if used in early spring. To help intensify the blue blossoms of hydrangeas, apply Bonide’s Garden Rich Aluminum Sulfate (see chart on Label) lightly around the plant, work into the soil if possible and water thoroughly.

Trees & Shrubs: Apply 1 lb. (2 cups) of Garden Rich Aluminum Sulfate per inch of diameter or per 3 ft. of height around the drip line of the plant avoiding contact with the plant itself. Water thoroughly.

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Questions & Answers

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Should Bonide Aluminum Sulfate be mixed with water?

I want to intensify the color blue in my hydrangeas.

You will want to blend the Aluminum Sulfate in the soil, if possible, and water it thoroughly after the application. Please see the Product Label for further information on how much to use and more specific treatment options for your hydrangeas.

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Would Bonide Aluminium Sulfate be the best product to lower the soil pH?

I have a 100 sq foot area with a ph of 7.0 and would like to plant blackberries. I live in Southern California.

Bonide Aluminum Sulfate is labeled for lowering soil pH for acid loving plants. For additional information, please contact Bonide at 315-736-8231.

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Is the Bonide Aluminum Sulfate a fertilizer?

I just planted Colorado blue spruce and I was going to buy a separate fertilizer. what would you recommend and how DO I apply it?


The Bonide Aluminum Sulfate is not a fertilizer at all but a product to help balance out the PH level in soils for plants that need a more acidic level to best grow. If you are looking for a general fertilizer for your trees then you could apply something like the Bayer Advanced 12 Month Tree & Shrub Protect and Feed. 

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