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Espoma® Soil Acidifier (30 lb.)


3.0 out of 5 stars


Quantity Available: 9

About This Product

Espoma Organic Soil Acidifier contains elemental sulfur & gypsum to help lower soil pH and turn hydrangeas blue. It is long lasting and much safer than other acidifiers like Aluminum Sulfate. Like all Espoma Organic products, no sludges or fillers are ever used. And because it’s made in our state-of-the-art solar powered manufacturing facility, consistency and quality are guaranteed.

  • Turns Hydrangeas blue
  • Lowers pH of soils
  • Great for blueberries & other berry plants
  • Approved for organic gardening
  • Safe for people, pets & planet

For use on: Blueberries, Hydrangeas and other acid loving plants. Use on all acid loving plants, trees and shrubs.

When to use: Apply in spring and every 60 days until desired pH is achieved

How much to use: Note: We recommend wearing gardening gloves when feeding your plants

  • Hydrangeas & Blueberries: Apply in the spring to lower soil pH
    New Plantings: 1-1/4 cups per plant.
    Established Plants: 2-1/2 cups per plant
    Spread evenly around the plant out to the drip line and water well. Repeat in 60 day intervals until desired pH or bloom color is achieved.
  • Potted Plants: One tbsp. for each 4 inches of pot diameter.
  • Broadcast Rate:
    Apply 12 lbs. per 100 sq. ft. for each one point reduction in soil pH desired. For heavy clay soils increase rate to 15 lb. Gradual reduction in soil pH is preferred as dramatic reduction can result in stress.
  • As a Fertilizer: Apply 1/2 cup per 100 square feet (1 tablespoon per plant) around the root zone

*Safer than Aluminum Sulfate due to potential toxic levels of Aluminum with continued use of Aluminum Sulfate.

How to apply: Spread evenly around the plant out to the drip line and water well. Repeat in 60 day intervals until desired pH or bloom color is achieved.


This product ships to your doorstep. Most orders placed before 2pm ET on business days will ship out the same day.

Customer Reviews

3.0 out of 5 stars

Based on 1 review

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Dr. Faye

3.0 out of 5 stars

I didn't buy yet, because...

I want to buy fertilizer to make my hydrangea blooms blue. I don't want to know the chemistry, etc. That tells me nothing, since I'm neither a gander nor a chemist. I am a shrink. So, I wish the instructions would say, "Good for making hydrangeas blue" if that is so."Good for making hard earth softer," "Good for making flowers bloom," or "Good for making foliage thicker," etc.

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