10 Best Soil Acidifier of 2025

Tested and Reviewed: Top 10 Soil Acidifier deals with expert ratings from 8.1 to a perfect 10

July 2025 Edition

Editor's Choice

9.7

ferti-lome

Fertilome (10660) Soil Acidifier Plus Iron (32 oz)

Free Shipping

Editor's bottom line:

“This soil acidifier is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Designed for acid loving plants such as Roses, Gardenia, Azaleas and Holly. See label for more.
Reduces alkalinity in alkaline soil while supplying trace elements vital to acid loving plants.
The soil acidifier contains essential elements including Iron, Zinc, Sulfur, Magnesium and Copper.
Comes in a 32 oz bottle of liquid concentrate. Dilute in water before application.
Mix at a rate of 2 tablespoons per gallon of water. See label for further instructions.

Show Price

Picked by 242 people today

9.5

Down To Earth All Natural Fertilizers

Down to Earth All Natural Acid Mix Fertilizer 4-3-6, 5 lb

Free Shipping

Main Highlights

A Natural fertilizer blended especially for acid lovers such as rhododendrons, azaleas, camellias, hydrangeas, evergreens, blueberries, raspberries, strawberries, potatoes and other plants that need a low pH
To encourage lush flowers and fruit, apply Acid Mix in early spring for vegetative growth and again when blooms appear.
Fall Applications can help promote root growth and boost resistance to extreme winter temperatures
All-Natural Ingredients: Made from organic, sustainably sourced materials, ensuring a chemical-free, eco-friendly option for gardeners seeking organic solutions.
Slow-Release Formula: The slow-release nature ensures a steady supply of nutrients, promoting long-lasting plant health and reducing the need for frequent applications.

Show Price

9.5

Earth Science

Earth Science Fast Acting Sulfur - Instantly Lower pH of Soil & Reduce Nutrient Runoff for Improved Growth & Color - Long Lasting Lawn Care for Acid Loving Plants (5lb)

Free Shipping

Main Highlights

Fast Acting Sulfur Earth Science Fast Acting Sulfur works immediately to lower the pH of your soil. Help your hydrangeas, azaleas, and blueberries absorb more food and improve fertilizer effectiveness.
Lower Soil pH If your soil pH is too high, your acid-loving plants might need a boost of sulfur. Earth Science Fast Acting Sulfur naturally lowers soil pH to help plants absorb more food.
Improve Color Earth Science Fast Acting Sulfur will help green up your lawn and create colorful blooms! This fertilizer enhancer is great for hydrangeas, azaleas, blueberries, and other acid-loving plants.
People & Pet Friendly Earth Science Fast Acting Sulfur is safe to use on any grass type, and safe for people and pets. Your human and furry friends can use the lawn immediately after application.
Nutri Bond Technology Earth Sciences patented Nutri-Bond Technology bonds with the soil to help keep more product where you put it. Nutri-Bond is better for the environment and helps your lawn & garden get the most out of every application.

Show Price

9.2

Save 9%

True Organic

True Organic Prilled Sulfur – Organic Fertilizer for Better Plant Growth, Flowers, Vegetables, and Herbs – Lowers Soil pH – 5lb Bag Covers 1,333 Sq. Ft.

9% OffFree Shipping

Main Highlights

Promotes Healthy Growth: True Prilled Sulfur supports overall plant growth, helping to produce superior flowers, vegetables, herbs, and foliage for an abundant harvest.
Essential for Lowering Soil pH: Naturally lowers soil pH, improving the availability of vital micronutrients that plants need for optimal health and growth.
Improves Flowering and Fruiting: Ideal for encouraging lush flowers and bountiful fruits by providing the necessary conditions for your plants to thrive.
Ideal for In-Ground Plants: Designed for balancing soil and improving plant performance in in-ground gardens, creating an ideal growing environment.
Generous Coverage: The 5lb bag covers up to 1,333 sq. ft., providing a long-lasting solution for large gardens or multiple applications.

Show Price

9.0

True Organic

True Organic Soil Acidifier – Lowers Soil pH for Acid-Loving Plants – Ideal for Turning Hydrangeas Blue – 6lb Bag

Free Shipping

Main Highlights

Lowers Soil pH: True Organic Soil Acidifier effectively lowers the pH of your soil, creating the perfect environment for acid-loving plants to thrive.
Perfect for Hydrangeas: Ideal for gardeners looking to turn hydrangeas blue by creating a more acidic environment for their blooms.
Encourages Acid-Loving Plants: Supports the growth of acid-loving plants like azaleas, rhododendrons, blueberries, and camellias, enhancing their health and vitality.
Improves Soil Composition: Helps improve the nutrient uptake in acidic soil, ensuring plants receive the essential elements they need for robust growth.
Generous Coverage: The 5lb bag of True Organic Soil Acidifier covers a substantial area, offering an efficient solution for adjusting soil conditions in your garden.

Show Price

Best Value

8.8

Save 17%

Espoma

Espoma Organic Soil Acidifier Soil Amendment; Lowers Soil pH and Turns Hydrangeas Blue! Contains Elemental Sulfur and can be Used for Organic Gardening 6 lb. Bag - Pack of 1

17% Off

Main Highlights

FOR USE ON: For all Acid-loving plants; Use Espoma Organic Soil Acidifier for azaleas, hydrangeas, rhododendrons, blueberries, evergreens, strawberries, camellias, and all plants that thrive in acidic soils
TURNS HYDRANGEAS BLUE: Turn Mophead & Lacecap hydrangeas blooms to an electric blue by adding Soil Acidifier and lowering soil pH
CONTAINS: Soil Acidifier contains elemental sulfur and gypsum
FOR ORGANIC GARDENING: Soil Acidifier is approved for organic gardening; It is a registered Organic Input Material meaning it meets all requirements for organic production
MADE IN THE USA: Product of the Espoma Company. The leader in natural organics since 1929

Show Price

8.6

My Garden Pool

Espoma Organic Soil Acidifier 6 lbs Bag With My Garden Pool PH Test Strips 20 ct. - Acidify, Enhance Hydrangea Color, Embrace Organic Gardening, Achieve Optimal Balance

Main Highlights

Enhanced Bloom Color: Espoma Organic Soil Acidifier delivers more than just a lower pH. It unlocks the potential for breathtakingly vibrant bloom colors, particularly in hydrangeas, creating a visually stunning garden.
Sustainable Gardening: Espoma's commitment to organic and eco-friendly gardening is a standout feature. By choosing this product, you're contributing to sustainable and responsible gardening practices that preserve the environment.
Quick pH Testing: My Garden Pool PH Soil Test Strips offer rapid pH testing. Within seconds, you'll have precise insights into your soil's pH levels, saving you time and effort in maintaining your garden's health.
Comprehensive pH Control: The combination of Espoma's pH-lowering ability and My Garden Pool's pH testing strips results in comprehensive pH control. You can easily adjust and monitor your soil's acidity, ensuring it's perfect for your plants.
Universal Applicability: Whether you're a seasoned gardener or a newbie, this bundle caters to all. Both products are versatile and suitable for various types of gardens, making them the perfect addition to your gardening arsenal.

Show Price

8.3

Jobe's Organics

Jobe's Organics Granular Soil Amendment, Organic Soil Acidifier for Blueberry and Hydrangea Plants, 6 lbs Bag

Main Highlights

Package contains 6 pounds organic soil acidifier grains and is produced to avoid wasteful runoff, mess, hazards and smells
Soil acidifier is formulated to decrease alkalinity and provide acid loving plants with natural elemental sulfur for vibrant color and lush foliage
Jobe's organic soil acidifier soil amendment contains no synthetic chemicals and is OMRI listed for organic gardening by the USDA
Application is simple and should be done at the time of planting and reapplied 2-3 times a year to maintain desired soil pH
Jobe's organic soil amendment is easily measured to provide the right pH level for acid loving plants without risk of burning

Show Price

8.1

Espoma

Espoma Organic Soil Acidifier Soil Amendment; Lowers Soil pH and Turns Hydrangeas Blue! Contains Elemental Sulfur & can be Used for Organic Gardening 30 lb. Bag - Pack of 1

Main Highlights

FOR USE ON: For all Acid-loving plants; Use Espoma Organic Soil Acidifier for azaleas, hydrangeas, rhododendrons, blueberries, evergreens, strawberries, camellias, and all plants that thrive in acidic soils.
TURNS HYDRANGEAS BLUE: Turn Mophead & Lacecap hydrangeas blooms to an electric blue by adding Soil Acidifier and lowering soil pH
CONTAINS: Soil Acidifier contains elemental sulfur and gypsum
FOR ORGANIC GARDENING: Soil Acidifier is approved for organic gardening; It is a registered Organic Input Material meaning it meets all requirements for organic production
MADE IN THE USA: Product of the Espoma Company. The leader in natural organics since 1929

Show Price

8.1

Dibbs Farms

Elemental Soil Acidifier Sulfur Pellets (50 Lbs.)

Main Highlights

No dust, hard, uniform pellets
CONTAINS: 90% Sulfur
USE ON: Lawns, shrubs, trees, and before planting vegetables and flowers.
FOR: The correction of high pH of soils.
RATE: Use 10 to 15 lbs. per 1,000 sq. ft. (1 to 1 1/2 lbs. per 100 sq. ft.) to reduce pH one unit.
APPLICATION: Spread evenly over the area and water thoroughly.

Show Price

Our Best Overall Choice

Best Choice

9.7

ferti-lome

Fertilome (10660) Soil Acidifier Plus Iron (32 oz)

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Designed for acid loving plants such as Roses, Gardenia, Azaleas and Holly. See label for more.
Reduces alkalinity in alkaline soil while supplying trace elements vital to acid loving plants.
The soil acidifier contains essential elements including Iron, Zinc, Sulfur, Magnesium and Copper.
Comes in a 32 oz bottle of liquid concentrate. Dilute in water before application.
Mix at a rate of 2 tablespoons per gallon of water. See label for further instructions.

Show Price

Related Deals You Might Like for Soil Acidifier

SONKIR Soil pH Meter, MS02 3-in-1 Soil Moisture/Light/pH Tester Gardening Tool Kits for Plant Care, Great for Garden, Lawn, Farm, Indoor & Outdoor Use (Green)

Show PriceView

Perfect Plants Organic Soil Acidifier 2Qt | Sulfur Based Plant Food | Changes Hydrangea Flower Color (2qts.)

Show PriceView

Down to Earth Garden Sulfur Soil Acidifier, 5 lb for Hydrangeas, Berries, Evergreens, Soil pH Adjuster

Show PriceView

Southern Ag Pelletized Soil Acidifier - 5LB

6% Off

Show PriceView

Espoma Organic Berry-Tone 4-3-4 Natural & Organic Fertilizer and Plant Food for All Berries. 4 lb. Bag. Use for Planting & Feeding to Promote Bountiful Harvest - Pack of 2

Show PriceView

I Must Garden Soil Sulfur Pellets: Organic Soil Acidifier | Naturally Promotes Lush Growth – 5lb Shaker Jar

Show PriceView

Farmer’s Secret Soil Revitalizer (32oz) - Organic (OMRI Listed) Dirt Health Booster - Liquid Compost Soil Amendment - Activated Humic Acid - Great for Fall/Spring Application

Show PriceView

Deals are Live

Special Amazon deal ends in:

10 Best Soil Acidifier of 2025

Tested and Reviewed: Top 10 Soil Acidifier deals with expert ratings from 8.1 to a perfect 10

ferti-lome

Fertilome (10660) Soil Acidifier Plus Iron (32 oz)

Editor's bottom line:

Main Highlights

Down To Earth All Natural Fertilizers

Down to Earth All Natural Acid Mix Fertilizer 4-3-6, 5 lb

Main Highlights

Earth Science

Earth Science Fast Acting Sulfur - Instantly Lower pH of Soil & Reduce Nutrient Runoff for Improved Growth & Color - Long Lasting Lawn Care for Acid Loving Plants (5lb)

Main Highlights

True Organic

True Organic Prilled Sulfur – Organic Fertilizer for Better Plant Growth, Flowers, Vegetables, and Herbs – Lowers Soil pH – 5lb Bag Covers 1,333 Sq. Ft.

Main Highlights

True Organic

True Organic Soil Acidifier – Lowers Soil pH for Acid-Loving Plants – Ideal for Turning Hydrangeas Blue – 6lb Bag

Main Highlights

Espoma

Espoma Organic Soil Acidifier Soil Amendment; Lowers Soil pH and Turns Hydrangeas Blue! Contains Elemental Sulfur and can be Used for Organic Gardening 6 lb. Bag - Pack of 1

Main Highlights

My Garden Pool

Espoma Organic Soil Acidifier 6 lbs Bag With My Garden Pool PH Test Strips 20 ct. - Acidify, Enhance Hydrangea Color, Embrace Organic Gardening, Achieve Optimal Balance

Main Highlights

Jobe's Organics

Jobe's Organics Granular Soil Amendment, Organic Soil Acidifier for Blueberry and Hydrangea Plants, 6 lbs Bag

Main Highlights

Espoma

Espoma Organic Soil Acidifier Soil Amendment; Lowers Soil pH and Turns Hydrangeas Blue! Contains Elemental Sulfur & can be Used for Organic Gardening 30 lb. Bag - Pack of 1

Main Highlights

Dibbs Farms

Elemental Soil Acidifier Sulfur Pellets (50 Lbs.)

Main Highlights

Our Best Overall Choice

ferti-lome

Fertilome (10660) Soil Acidifier Plus Iron (32 oz)

Editor's bottom line:

Main Highlights

Related Deals You Might Like for Soil Acidifier

SONKIR Soil pH Meter, MS02 3-in-1 Soil Moisture/Light/pH Tester Gardening Tool Kits for Plant Care, Great for Garden, Lawn, Farm, Indoor & Outdoor Use (Green)

Perfect Plants Organic Soil Acidifier 2Qt | Sulfur Based Plant Food | Changes Hydrangea Flower Color (2qts.)

Down to Earth Garden Sulfur Soil Acidifier, 5 lb for Hydrangeas, Berries, Evergreens, Soil pH Adjuster

Southern Ag Pelletized Soil Acidifier - 5LB

Espoma Organic Berry-Tone 4-3-4 Natural & Organic Fertilizer and Plant Food for All Berries. 4 lb. Bag. Use for Planting & Feeding to Promote Bountiful Harvest - Pack of 2

I Must Garden Soil Sulfur Pellets: Organic Soil Acidifier | Naturally Promotes Lush Growth – 5lb Shaker Jar

Farmer’s Secret Soil Revitalizer (32oz) - Organic (OMRI Listed) Dirt Health Booster - Liquid Compost Soil Amendment - Activated Humic Acid - Great for Fall/Spring Application

Earth Science Fast Acting Sulfur (25 lb.)

Espoma UL30 Organic Soil Acidifier Fertilizer, 30 lb,Multicolor - 2 Pack

Soil Acidifier, 90% Sulfur (50lb) - 50 LB

Deals are Live