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10 Best Iron Supplements For Plants 2026 in the United States

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Our Top Picks

#1

Winner

Grow More 0.2-0-0 EDDHA Iron Chelate for Greener Plants on Soils with pH of 7 or Above - 1lb of Water Soluble Chelated 6% Iron for Plants

Rating
10.0
Chosen by1,167
Type of Iron Supplement
Iron Concentration
Application Method

Most important from
1038 reviews

Type of Iron Supplement
For high pH soils, EDDHA has been a game changer, with trees and perennials greening up in a day or two.
Iron Concentration
A tiny half teaspoon mixed with a large amount of water goes a long way, and the container lasts a long time.
Application Method
Applying the product is straightforward, whether shaken around a tree's canopy ring or mixed in a watering can for smaller plants.
Compatibility with Other Nutrients
It's safe to use even if other fertilizers are already in the soil, providing flexibility in application.
pH Level of the Soil
This product works in alkaline soils when nothing else does, making it invaluable for problematic soil conditions.

The Grow More 0.2-0-0 EDDHA Iron Chelate is a water-soluble iron supplement specifically designed for plants growing in problematic soils with a pH level of 7 or higher. This product is highly effective in addressing iron deficiency, which is commonly seen as yellowing leaves, and promoting lush green foliage.

One of its standout features is its 100% water-solubility, making it easy to mix and apply, ensuring quick absorption and rapid results. Additionally, it is compatible with various soils such as caliche, adobe clay, and alkaline soil, making it versatile for different gardening needs. However, it should be noted that while it offers comprehensive nutrition, it is primarily focused on iron supplementation and may need to be used alongside other fertilizers to provide a balanced nutrient regimen for your plants.

This product is manufactured in the USA. The Grow More EDDHA Iron Chelate is suitable for all-purpose use, including soil conditioning and plant growth enhancement. It is an excellent choice for gardeners dealing with high pH soils and looking for a reliable solution to iron deficiency in plants.

Rating
10.0
Chosen by1,167
Type of Iron Supplement
Iron Concentration
Application Method

Most important from
1038 reviews

Type of Iron Supplement
For high pH soils, EDDHA has been a game changer, with trees and perennials greening up in a day or two.
Iron Concentration
A tiny half teaspoon mixed with a large amount of water goes a long way, and the container lasts a long time.
Application Method
Applying the product is straightforward, whether shaken around a tree's canopy ring or mixed in a watering can for smaller plants.
Compatibility with Other Nutrients
It's safe to use even if other fertilizers are already in the soil, providing flexibility in application.
pH Level of the Soil
This product works in alkaline soils when nothing else does, making it invaluable for problematic soil conditions.
#2

LawnStar Liquid Iron (32 OZ) for Plants - Multi-Purpose, Suitable for Lawn, Flowers, Shrubs, Trees - Treats Iron Deficiency, Root Damage & Color Distortion – EDTA-Free, American Made

Rating
9.4
Type of Iron Supplement
Application Method
pH Level of the Soil

Most important from
3742 reviews

Type of Iron Supplement
LawnStar Chelated Liquid Iron is a great value for its price, offering a reliable solution for iron deficiencies in various plants.
Application Method
LawnStar Liquid Iron effectively treated chlorosis in River Birch trees, resulting in greener leaves after a few weeks.
pH Level of the Soil
The product's iron sulfate composition is particularly effective in high pH soils, providing more available iron for plants.

LawnStar Liquid Iron is a versatile iron supplement designed for a variety of plants including lawns, flowers, shrubs, and trees. This product is EDTA-free and uses a sugar-based chelation method, which helps in efficient iron delivery even in soils with a high pH of up to 9.5. It aims to combat iron deficiency, promoting greener and healthier plants by supporting chlorophyll production and improving root health for robust growth.

The liquid form makes it easy to apply either as a root drench or foliar spray, offering flexibility in how it can be used. The 32-ounce bottle provides ample coverage, making it a practical choice for both small gardens and larger landscapes. However, it might not be the best option for those seeking a quick-fix solution, as long-term use is recommended for consistent results.

While it’s highly stable and effective in challenging soil conditions, it may require careful monitoring to ensure compatibility with other nutrient regimes. LawnStar Liquid Iron’s USA-made formula provides a reliable option for addressing iron deficiencies across a wide range of plants.

Rating
9.4
Type of Iron Supplement
Application Method
pH Level of the Soil

Most important from
3742 reviews

Type of Iron Supplement
LawnStar Chelated Liquid Iron is a great value for its price, offering a reliable solution for iron deficiencies in various plants.
Application Method
LawnStar Liquid Iron effectively treated chlorosis in River Birch trees, resulting in greener leaves after a few weeks.
pH Level of the Soil
The product's iron sulfate composition is particularly effective in high pH soils, providing more available iron for plants.
#3

Espoma Organic Iron-tone 3-0-3 Organic Fertilizer and Plant Food to Help Correct Iron Deficiency (Chlorosis). 5 lb. Bag. Turns Yellow to Green, Non Staining Iron

Espoma Organic Iron-Tone is a versatile iron supplement designed to tackle iron deficiency, commonly seen as yellowing leaves, in a wide variety of plants, including lawns, shrubs, and flowers. The product comes in a 5-pound bag and is formulated with a 3-0-3 fertilizer analysis, containing 6% iron and 17% sulfur, making it effective in addressing chlorosis. A notable strength is its organic certification, which ensures it's suitable for organic gardening, meeting stringent organic production standards. Iron-Tone's non-staining formula is ideal for use around patios and walkways, eliminating concerns about unsightly marks.

One of its major advantages is the ease of application, as it requires no mixing and is ready to use directly from the bag. This is particularly beneficial for those who prefer straightforward garden care solutions. The product is enhanced with the exclusive Bio-tone formula, which adds a blend of beneficial microbes to improve soil health. Moreover, its environmental safety is a plus, free from sludges or toxic ingredients.

The product's effectiveness could vary depending on the soil's pH level, as specific conditions might alter nutrient uptake. Additionally, while it is compatible with other nutrients, users should ensure not to over-fertilize or disrupt nutrient balance. The medium coverage may also require larger quantities for extensive garden areas. Espoma Organic Iron-Tone is an excellent choice for gardeners looking for an organic and easy-to-use solution to correct iron deficiencies, though consideration should be given to soil conditions and coverage needs.

Buying Guide for the Best Iron Supplements For Plants

Choosing the right iron supplement for your plants is crucial for their health and growth. Iron is an essential micronutrient that plays a vital role in chlorophyll production and overall plant vitality. When plants lack iron, they can suffer from chlorosis, which causes yellowing leaves and stunted growth. To ensure your plants receive the right amount of iron, it's important to understand the different types of iron supplements available and how they can benefit your plants. Here are some key specifications to consider when selecting an iron supplement for your plants.
Type of Iron SupplementIron supplements for plants come in various forms, including chelated iron, iron sulfate, and iron spikes. Chelated iron is often preferred because it is more easily absorbed by plants and remains available in the soil for a longer period. Iron sulfate is a more traditional form and can be effective but may require more frequent applications. Iron spikes are slow-release options that can be convenient for long-term feeding. Choose the type based on your preference for application frequency and ease of use.
Iron ConcentrationThe concentration of iron in the supplement is important because it determines how much iron your plants will receive. Higher concentrations mean more iron per application, which can be beneficial for severely iron-deficient plants. However, too much iron can be harmful, so it's important to follow the recommended dosage. For general maintenance, a lower concentration may be sufficient, while higher concentrations are better for correcting deficiencies.
Application MethodIron supplements can be applied in different ways, including foliar sprays, soil drenches, and granular applications. Foliar sprays are absorbed quickly through the leaves and can provide rapid results, making them ideal for acute deficiencies. Soil drenches are applied directly to the soil and are absorbed by the roots, providing a more gradual and sustained release of iron. Granular applications are mixed into the soil and can provide long-term feeding. Choose the method that best fits your plant's needs and your gardening routine.
Compatibility with Other NutrientsSome iron supplements are formulated to work in conjunction with other nutrients, which can enhance their effectiveness. For example, iron chelates often include other micronutrients like manganese and zinc. These combinations can help address multiple deficiencies at once and promote overall plant health. If your plants have multiple nutrient deficiencies, look for a supplement that provides a balanced mix of nutrients.
pH Level of the SoilThe pH level of your soil can affect the availability of iron to your plants. Iron is more readily available in slightly acidic soils (pH 5.0-6.5). If your soil is too alkaline, iron may become less available, even if it is present in the soil. In such cases, using chelated iron can be particularly beneficial as it remains available to plants in a wider range of pH levels. Test your soil's pH and choose an iron supplement that is compatible with your soil conditions.

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