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Item #:
10609173
Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon
86% of respondents would recommend this to a friend
Item #:
10609173
KYD 59
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Humboldts Secret Calcium, Magnesium and Iron Supplement is a well-balanced formula designed to address any plant deficiencies that may be present, efficiently supporting nutrient uptake and absorption, and is suitable for hydroponics, soil, and container gardens.
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What Stands Out
Comprehensive Nutrition
This liquid supplement provides essential calcium, magnesium, and iron, promoting healthy plant growth during both vegetative and flowering stages.
Hydroponic Optimization
Specifically formulated for hydroponic systems, ensuring efficient nutrient absorption and maximizing yields compared to traditional fertilizers.
Large Capacity
A generous 2.5-gallon size reduces frequency of purchases and provides a cost-effective solution for avid hydroponic gardeners.
Product Details
- Formulated as a source of calcium, magnesium, and chelated iron to address plant micronutrient deficiencies
- Effectively corrects common plant nutrient deficiencies and imbalances
- Supports nutrient uptake and absorption, promoting healthy growth in both vegetative and flowering stages
- Suitable for hydroponics, soil, and container gardens, ensuring strong and healthy plants
- Highly recommended for plants growing in coco coir medium or using reverse osmosis water for magnified absorption
- An essential liquid nutrient fertilizer for promoting robust and productive plant growth
| Brand Name | Humboldts Secret |
| Model Number | CalMag & Iron |
| Global Trade Identification Number | 00648260730406 |
| Number of Packs | 1 |
| Manufacturer | Humboldts Secret |
| Item Highlight | Calcium, Magnesium & Chelated Iron Formula, Prevents Nutrient Deficiencies, For Soil, Coco, Hydroponics & RO Water, Easy Mix |
| UPC | 648260730406 |
| Unit Count | 128 Fluid Ounces |
| Part Number | TUEEQE-06 |
| Item Form | Liquid |
| Specific Uses For Product | Hydroponic |
| Application Method | soil drench or foliar spray |
| Coverage | Medium |
| Target Species | flowering plants |
| Liquid Volume | 128 fluid ounces |
| Mixing Ratio | 2-5 ml/gallon |
| Brand | Humboldts Secret |
| Item Weight | 8.5 lbs (3.86 kg) |
Who Should Buy?
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Hydroponic Growers
Ideal for hydroponic systems, enhancing nutrient uptake during both vegetative and flowering stages of plant growth.
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Plant Enthusiasts
Perfect for dedicated gardeners keen on optimizing their plants’ mineral intake for robust growth and enhanced yields.
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Vegetable Cultivators
A great choice for growers of vegetables needing extra calcium and magnesium for healthier and more productive plants.
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Soil Growers
Not suitable for traditional soil growing methods, which may already provide sufficient nutrients naturally without supplementation.
Product Description
Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon
Dietary Supplement Disclaimer
Statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition.
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Customer Questions & Answers
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Question:
What are the main benefits of using Humboldts Secret Calcium, Magnesium, and Iron Supplement?
Answer: Humboldts Secret Calcium, Magnesium, and Iron Supplement is designed to provide essential nutrients that support healthy plant growth and development. These nutrients help prevent deficiencies that can negatively affect plant performance. Calcium promotes cell wall strength, magnesium aids in chlorophyll production for photosynthesis, and iron contributes to overall plant vitality. Using this supplement ensures that your plants flourish during both the vegetative and flowering stages, resulting in improved yield and quality. -
Question:
How do I apply Humboldts Secret Calcium, Magnesium, and Iron Supplement in my hydroponic system?
Answer: To use Humboldts Secret Supplement effectively in your hydroponic system, follow the manufacturer’s mixing instructions for dilution. Typically, you will need to add a specific amount of the supplement to your nutrient solution. Regularly monitor your nutrient levels, as this product can enhance the nutrient profile in your reservoir, promoting better health in your plants. It's ideal during critical growth phases, giving your crops the boost they need to thrive in a hydroponic environment. -
Question:
Can this supplement be used for soil-grown plants as well?
Answer: Yes, Humboldts Secret Calcium, Magnesium, and Iron Supplement can be utilized for soil-grown plants. While it is particularly popular in hydroponics, its nutrient formulation is equally beneficial for plants in any growing medium. By following dilution rates suggested on the label, you can enhance nutrient uptake in the soil, ensuring your plants receive the essential minerals they need during their growing stages. -
Question:
Is this product safe for all types of plants?
Answer: Absolutely! Humboldts Secret Calcium, Magnesium, and Iron Supplement is safe for a wide array of plants, including vegetables, flowers, and herbs. This versatility makes it a go-to choice for indoor and outdoor gardeners alike. However, always refer to the specific needs of your plants and adjust the dosage accordingly. This way, you can cater the nutrient levels appropriately and minimize any risk of over-fertilization. -
Question:
How often should I use this calcium, magnesium, and iron supplement?
Answer: The frequency of application depends on the growth stage of your plants and their specific nutrient needs. Generally, it is recommended to use Humboldts Secret Supplement every 1-2 weeks during the vegetative and flowering stages. Regularly check for signs of deficiency in your plants, as this can help you adjust the application schedule. Consistent use will help maintain optimal nutrient levels, promoting vigorous growth and productivity. -
Question:
What symptoms indicate that my plants may need this supplement?
Answer: If your plants display yellowing leaves, stunted growth, or poor flowering, it may indicate a nutrient deficiency. Yellowing, especially along leaf veins, can signify a lack of iron, while leaf edges curling can suggest magnesium deficiencies. Regularly inspecting your plants for these symptoms can guide you in using Humboldts Secret Supplement to effectively address and rectify these issues, ensuring your plants regain their health and vitality. -
Question:
Is Humboldts Secret Supplement compatible with other nutrients?
Answer: Yes, Humboldts Secret Calcium, Magnesium, and Iron Supplement can be used in conjunction with other nutrient products. It enhances the overall nutrient profile of your feeding regimen, improving nutrient absorption for your plants. However, it’s wise to monitor the total nutrient concentration to avoid over-fertilization. Many growers combine this product with their standard nutrient solutions to create a balanced diet for their plants. -
Question:
What type of container is the 1 Quart size sold in?
Answer: The 1 Quart size of Humboldts Secret Calcium, Magnesium, and Iron Supplement typically comes in a sturdy, recyclable bottle that is designed for easy pouring and accurate measuring. Its compact size allows for convenient storage and handling while ensuring that you get the exact dosage needed for your plants. The bottle is also designed to preserve the quality of the liquid nutrients inside, keeping them effective for your gardening needs. -
Question:
Can I mix this supplement with my regular fertilizer?
Answer: Yes, you can mix Humboldts Secret Calcium, Magnesium, and Iron Supplement with your regular fertilizer. This combination allows for a more comprehensive nutrient delivery system, as it enhances the availability of essential minerals to your plants. Be sure to follow the recommended dosages for both products to achieve a well-balanced nutrient solution that promotes optimal growth and development during all phases. -
Question:
Where can I buy Humboldts Secret Calcium, Magnesium and Iron Supplement in Cayman Islands?
Answer: You can purchase Humboldts Secret Calcium, Magnesium, and Iron Supplement from Ubuy in Cayman Islands. Ubuy offers a convenient online shopping experience with a variety of options to choose from. You can easily find this essential product for your hydroponic needs on their platform, ensuring a swift and straightforward way to enhance the health of your plants.
Humboldts Secret Fertilizers & Plant Food CalMag & Iron Editorial Review
Humboldts Secret CalMag & Iron is a nutrient fertilizer designed to combat deficiencies in calcium, magnesium, and chelated iron, making it ideal for ensuring healthy vegetative and flowering growth in a variety of growing mediums including soil, coco, hydroponics, or even RO water. Users have reported impressive results, such as reversing chlorosis in just days and enhancing plant health significantly. This concentrated liquid option allows for flexibility in application, whether through soil drench or foliar spray. Customers appreciate its effectiveness, noting a significant increase in vibrant foliage and yield, making it a popular choice for both indoor and outdoor gardens.
Customer Reviews & Ratings
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Pros
- Highly effective for reversing leaf yellowing
- Concentrated formula lasts a long time
- Suitable for various growing methods
- Quick results in days with clear benefits
- Excellent trace element source for plants
Cons
- Instructions can be a bit confusing for first-time users
Platform Trust & Buyer Confidence
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Jasmin
Verified buyer
“Great products and very good service: very easy and very fast international delivery.”
9 September 2026 · via Trustpilot
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Anke
Verified buyer
“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”
10 September 2026 · via Trustpilot
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Hazel
Verified buyer
“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”
10 September 2026 · via Trustpilot
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Opaleye
Verified buyer
“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”
11 September 2026 · via Trustpilot
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Adele
Verified buyer
“Easy to find and order what you want on the website. Delivery is quick to the UK”
8 September 2026 · via Trustpilot
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KYD 59
Order now and get it around Thursday, October 01
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Features & Benefits
- Provides essential micronutrients
- Corrects common plant deficiencies
- Efficient nutrient uptake and absorption
- Suitable for Hydroponics, soil, and container gardens
- Suitable for coco coir medium and reverse osmosis water
- Optimal for vegetative and flowering stage
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