Best Iron Sulfate Garden Fertilizers of 2025
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Iron sulfate garden fertilizers are an effective and affordable way to improve the health and growth of plants in your garden. These fertilizers contain iron, which is an essential micronutrient that helps plants produce chlorophyll and enzymes for photosynthesis. Iron sulfate fertilizers are particularly useful for correcting iron deficiencies in alkaline soils, which can cause yellowing and stunted growth in plants. They are also a great option for acid-loving plants like azaleas, rhododendrons, and blueberries. Overall, iron sulfate garden fertilizers are a reliable and easy way to give your plants the nutrients they need to thrive.
At a Glance: Our Top Picks
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Top 7 Iron Sulfate Garden Fertilizers
SouthernGRO Iron Sulfate Fertilizer
SouthernGRO Iron Fertilizer is a garden fertilizer by SouthernGRO. This product offers a lush green color to your plants, corrects chlorosis, helps in achieving acidic soil conditions, and enhances plant growth. The rich green coloring provides an aesthetically pleasing look to your garden. By correcting chlorosis, it helps in improving the overall health of your plants. Creating acidic soil conditions promotes optimal nutrient absorption for plant growth. With SouthernGRO Iron Fertilizer, you can easily maintain healthy and vibrant plants in your garden.
Alpha Chemicals Ferrous Sulfate Heptahydrate
Alpha Ferrous Sulfate is a high-quality garden fertilizer from Alpha Chemicals. It is a very soluble heptahydrate form of ferrous sulfate, containing 20% iron. This product is commonly used in water treatment, moss control, and animal feed supplements. The very soluble form ensures quick and effective absorption by plants and animals. With its 20% iron content, Alpha Ferrous Sulfate provides essential nutrients for healthy plant growth and can help prevent iron deficiency. It is also an ideal option for controlling moss growth in lawns and gardens. Additionally, it is a reliable choice for animal feed supplements, ensuring proper nutrition for livestock and pets. Alpha Ferrous Sulfate is a versatile fertilizer that offers convenience and benefits for various applications.
Greenway Biotech Ferrous Sulfate Heptahydrate Fertilizer
Greenway Ferrous Fertilizer is a high-quality organic lawn fertilizer that includes 20% Iron and 12% Sulfur in a 100% water-soluble powder form. It helps lower soil pH for better nutrient absorption, treats iron chlorosis in plants, aids in chlorophyll production, and is a good source of iron to combat anemia. This fertilizer is convenient for enhancing plant greening without excessive growth, making it ideal for vegetable and plant growth.
LawnStar Liquid Iron Fertilizer
LawnStar Liquid Iron is a professional-grade fertilizer designed for effective iron delivery, even in tough alkaline soils. It helps you combat iron deficiency, reversing yellowing leaves and promoting vibrant green color in your plants. With its strong formulation, this liquid iron supports healthy root development, ensuring steady growth for your lawn and garden. Additionally, it remains stable in challenging soil conditions, providing consistent absorption for long-lasting results. You’ll find it easy to use—just mix as directed for root drenching or foliar spray to maintain your plants’ health.
Dr. Soil Acidifier Granules Iron and Sulfur Fertilizer, 7 lb
Dr. Soil Acidifier Granules Iron and Sulfur Fertilizer is a non-staining, versatile product that corrects iron deficiency and reduces soil pH. It's made up of 22% iron and 55% sulfur, making it safe to use on a variety of plants, including turf, flowers, vegetables, and shrubs. Dr. Iron is OMRI listed and approved for organic gardening.
OULLYY Ferrous Sulfate Fertilizer
OULLYY Fertilizer 20% Iron is designed to enhance the health of your plants by conditioning the soil. It lowers the pH of alkaline soils, making it easier for your plants to absorb essential nutrients. To use, simply dilute the fertilizer with water and apply it directly to the roots every 30 days. With 20% iron and 12% sulfur, this product is highly soluble, ensuring quick absorption. For optimal results, apply it in the cooler morning hours to maximize its effectiveness and provide your garden with that vibrant green color you desire.
Monterey Dr Soil Acidifier Granules, 21 lb
Monterey Dr Soil Acidifier Granules is a non-staining fertilizer that corrects iron deficiency in plants and reduces soil pH. It is made up of 22% iron and 55% sulfur and can be used on flowers, vegetables, ground-covers, shrubs, and more. The product is easy to apply and suitable for organic gardening.
Frequently Asked Questions (FAQs)
1. What is iron sulfate used for in the garden?
Iron sulfate is commonly used in the garden to reduce the alkalinity of soils and make essential elements and nutrients more available to plants that thrive in acidic conditions. It helps create a favorable environment for the healthy cultivation of acid-loving plants.
2. How do I apply iron sulfate to my garden?
To apply iron sulfate to your garden, gently fork it into the soil surface without disturbing the plant roots. Alternatively, you can sprinkle the product over the soil surface, around the stem of the plant, and water thoroughly. This ensures that the iron sulfate is distributed evenly and reaches the plants' roots.
3. Is iron sulfate toxic to humans?
Iron sulfate is generally considered to be non-toxic to humans. However, it may cause skin and eye irritation if contact occurs. Inhalation of iron sulfate may lead to headaches, nausea, and respiratory irritations. It is important to handle iron sulfate with care and follow proper safety precautions.
4. Is iron sulfate a fungicide?
Iron sulfate can be used as a fungicide in ochre wood paint. It helps expand the wood's pores, allowing oil to penetrate and acts as a mordant. It also aids in creating a slight saponification of the oil, enabling it to be diluted with water. However, its use as a fungicide may be limited to specific applications.
5. What is the best way to spread iron sulfate?
The best way to spread iron sulfate is by dissolving the required amount of granules in water and applying the solution to your lawn using a watering can or a pump sprayer. Once applied, it is important to thoroughly water the solution into the soil to ensure proper distribution and absorption.
6. What is the best source of iron for plants?
Ferrous sulfate (FeSO4. 2H2O) is an effective and commonly used source of supplemental iron for plants. It can be mixed with water and sprayed onto plant leaves to provide iron to iron-deficient plants. Mixing 1 to 2 ounces of ferrous sulfate in 1 gallon of water is a common ratio for foliar application.
During our iron sulfate garden fertilizer research, we found 24 iron sulfate garden fertilizer products and shortlisted 7 quality products. We collected and analyzed 31,049 customer reviews through our big data system to write the iron sulfate garden fertilizers list. We found that most customers choose iron sulfate garden fertilizers with an average price of $16.24.
The iron sulfate garden fertilizers are available for purchase. We have researched hundreds of brands and picked the top brands of iron sulfate garden fertilizers, including SouthernGRO, Alpha Chemicals, Greenway Biotech, Inc., LawnStar, Monterey. The seller of top 1 product has received honest feedback from 71 consumers with an average rating of 4.4.
Steven Taylor grew up in a small town called Beaufort in South Carolina and his passion for building and woodworking has led him to master the latest garden gadgets. He always holds every chance to patch up or sand down his beloved garden. There are various novel technologies in his articles.