Espoma Soil Acidifier

5 out of 5 stars 1 Reviews | 2 Q&A

Espoma Soil Acidifier

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Average Rating

5 out of 5 stars Rating: 5

1 Review | 2 Q&A

Product Overview

Espoma Soil Acidifier is one of the best soil acidifier on the market today. It contains all-natural ingredients that effectively acidify or lower the pH of the soil, and is used to correct the alkaline soil's problem. This can turn hydrangeas from pink to blue color, and it also helps with the growth and dark greening of plants. It has a low salt index so it will not burn your plants and it's non-hazardous and non-toxic so it's safe to use around children and pets.

Espoma Soil Acidifier can provide sulfur all-season long when you use it regularly as a part of your fertilization program. A soil analysis is always recommended to know the proper rate of application. This product weighs 6 pounds and it is packed in an easy-to-open bag. One pound is equivalent to approximately 2 cupfuls.

Features and Specs

Active Ingredient Sulfur - 30%
Target pests Lower pH of Soil
For use in Hydrangeas, Blueberries and all Soil of Shrubs or Plants that need Acidic Soil
Application Hydrangeas and Blueberries: 1 1/4 to 2 1/2 cups Broadcast Rate: Apply 12 lbs per 100 sq. ft. for 1 point reduction in soil pH
Container Rate: 1 tsp for each 4" pot diameter
* See label for complete application instructions
Pet safe Yes, if used as directed on label
Shipping Weight 6.13 lbs
Manufacturer The Espoma Company (Mfg. Number: GSUL6)
UPC 050197030069



One pound equals approx. 2 cupfuls

For Hydrangeas & Blueberries:

Apply in the spring to lower soil pH. For new plants use 1-1/4 cups. For established plants use 2-1/2 cups. 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.

Broadcast Rates:

Apply 12 lbs. per 100 sq. ft. for each one point reduction in soil pH desired. For heavy clay soils increase rate to 15 lbs. Gradual reduction in soil pH is preferred as dramatic reduction can result in stress.

Container Applications:

Add one tbsp. for each 4 inch of pot diameter.

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  • 5 of 5 Stars

    Blackberries love it!

    By Cindy on 06/05/2020

    Since I have started using this Soil Acidifier on my Blackberry Bushes, my yield has doubled. Very happy with this product.

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    2 of 2 people found this review helpful

Questions & Answers

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Can I dissolve Espoma Soil Acidifier in water to apply?

Our landscaper laid weed barrier fabric when planting but I need this to keep flowers blue.


Espoma Soil Acidifier is designed to be sprinkled around the plants. There is no need to dissolve in water.

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7 of 38 people found this answer helpful

My gardenia plant leaves are turning yellow

How much of the sulfur should I use to improve its growth? It is planted in a container since the winters in VA are very cold. I believe I live in Zone 6-7. I have kept it on my porch away from direct sunlight. Any advice would be appreciated! Thanks!

We apologize but we just started carrying this product and do not see that it instructions for use on Gardenias.  We would recommend contacting the manufacturer directly for this question, The Epsoma Company can be reached at 888-377-6621.

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1 of 1 people found this answer helpful

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Espoma Soil Acidifier 5 out of 5 stars Rating: 5 (1 Reviews / 2 Q&A)

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