Monterey Dr. Iron
Best organic iron supplement for gardeners reviving yellowing, nutrient-deficient plants.
Monterey Dr. Iron is a 7 lb granular iron supplement designed to combat iron deficiency, a common cause of yellowing leaves and stunted plant growth. This OMRI-listed product delivers essential iron and sulfur, promoting vibrant plant health. Its controlled-release formula ensures season-long feeding, while the fast-acting nature provides rapid, visible improvements. Safe for organic gardening, it won't stain concrete or burn foliage. Ideal for lawns, flowers, vegetables, trees, and shrubs, it's easy to apply by spreading and watering.
$19.99
Owner Satisfaction
4.6
/ 5
Category Rank
1928
/ 4348
#1928 in Fertilizers
Price vs Category Average
-68%
Below average
Weight
7
/ lb
Who it's for
- Gardeners needing immediate results for yellowing foliage
- Homeowners managing alkaline soil conditions
- Plant owners preferring versatile application methods
Who should skip it
- Gardeners looking for long-term soil health solutions
- Budget-conscious gardeners seeking low-cost solutions
- Users with delicate stone or concrete patios
Performance breakdown
Nutrient Density
High iron and sulfur concentrations deliver potent results for chlorotic plants.
Application Versatility
Works effectively across lawns, ornamental shrubs, and vegetable garden beds alike.
Surface Safety
Non-staining formula eliminates the risk of damaging concrete walkways or patios.
Organic Compliance
OMRI listing ensures full compatibility with strict organic gardening standards.
Ease of Use
Simple broadcast application makes nutrient delivery straightforward for any skill level.
Release Efficiency
Controlled-release granules provide a reliable balance of immediate and lasting nutrition.
Key Specs
Weight
7 lb
Iron Content
22%
Sulfur Content
55%
Release Type
Slow Release
Form
Granular
Application Method
Broadcast
Organic Certified
Yes
Season of Application
Spring, Summer, Fall
Features
- Corrects iron deficiency and yellowing leaves.
- Provides season-long plant nutrition.
- Shows visible plant health improvements quickly.
- Safe for concrete surfaces and plant foliage.
- Approved for organic gardening systems.
- Simple granular application method.
- Versatile for various plant types.
What customers say
Customers consistently highlight the exceptional efficacy of Monterey Dr. Iron, noting its rapid ability to green up yellowing plants suffering from iron deficiency. Reviewers appreciate that this product delivers noticeable results quickly, often after just one application. The primary sentiment revolves around its reliable quality and the excellent value it provides, making it a trusted solution for maintaining vibrant, healthy gardens without needing constant reapplication.
Know before you buy
If your plants have yellowing leaves while the veins remain green—a condition known as chlorosis—they are likely suffering from an iron deficiency. This supplement is specifically formulated to correct this issue and restore healthy green color to your foliage.
No, Monterey Dr. Iron is designed to be non-staining. Unlike some other iron-based fertilizers that can leave rust-colored marks on concrete or stone, this formula is safe to use around your hardscaping.
It is perfectly safe for vegetable gardens. Because it is OMRI-listed for organic gardening, you can confidently use it on your edibles, as well as on flowers, trees, shrubs, and lawns.
The formula is designed to be fast-acting, so you should see visible improvements in plant color and vigor relatively quickly. The controlled-release component then ensures your plants continue to receive steady nutrition throughout the season.
You can simply broadcast the granules over the soil surface. For the best results, follow the application by watering the area thoroughly to help the nutrients reach the root zone.
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$20