---
product_id: 42491759
title: "Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 32 Ounce"
brand: "humboldts secret"
price: "244.93 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Humboldts Secret"
url: https://www.desertcart.tn/products/42491759-humboldts-secret-calmag-and-iron-liquid-plant-nutrient-fertilizer-32
store_origin: TN
region: Tunisia
---

# Fast-acting nutrient absorption Calcium, Magnesium & Chelated Iron blend 32 fl oz liquid formula Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 32 Ounce

**Brand:** humboldts secret
**Price:** 244.93 DT
**Availability:** ✅ In Stock

## Summary

> 🌱 Unlock your garden’s secret weapon for unstoppable growth!

## Quick Answers

- **What is this?** Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 32 Ounce by humboldts secret
- **How much does it cost?** 244.93 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/42491759-humboldts-secret-calmag-and-iron-liquid-plant-nutrient-fertilizer-32)

## Best For

- humboldts secret enthusiasts

## Why This Product

- Trusted humboldts secret brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid Recovery Boost:** Accelerates photosynthesis and root strength to revive stressed plants quickly.
- • **Maximized Mineral Uptake:** Chelated iron ensures superior absorption, fueling lush foliage and abundant blooms.
- • **Fruiting & Flowering Focus:** Prevents blossom end rot and promotes firm fruit set for a bountiful, professional-grade harvest.
- • **Power-Packed Plant Nutrition:** Delivers essential Ca, Mg & chelated Fe for vibrant growth and nutrient balance.
- • **Versatile Garden Compatibility:** Optimized for soil, hydroponics, coco coir, and RO water setups—grow anywhere, anytime.

## Overview

Humboldts Secret CalMag & Iron is a premium 32 oz liquid fertilizer delivering calcium, magnesium, and chelated iron to prevent nutrient deficiencies and enhance plant health. Designed for all growing mediums including soil, hydroponics, and coco coir, it supports vigorous vegetative growth, rapid recovery, and superior fruiting performance. Trusted by over 2,000 growers with a 4.6-star rating, this formula ensures maximum mineral absorption and balanced nutrition for thriving indoor and outdoor gardens.

## Description

desertcart.com : Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 32 Ounce | Calcium, Magnesium & Chelated Iron Formula, Prevents Nutrient Deficiencies, For Soil, Coco, Hydroponics & RO Water, Easy Mix : Patio, Lawn & Garden

Review: Awesome product - Awesome stuff, Gonna make it an amazing season!!
Review: Please help me with my light , my Tatu 1000W LED Grow Light - Like

## Features

- Packaging Update: You may receive previous or updated packaging during our transition. Same formula, same performance. Strength for Every Stage - Humboldts Secret supplement with cal mag for plants delivers calcium, magnesium, and chelated iron to prevent deficiencies. It fortifies stems, improves leaf color, and supports flowering and fruiting plants for vigorous, healthy growth in any type of garden.
- Fast-Acting Plant Recovery: Our balanced formula with calmag and chelated iron targets issues caused by nutrient imbalances, helping plants recover quickly. It boosts photosynthesis, nutrient transport, and root strength in vegetables, flowers, and herbs grown indoors or outdoors.
- Maximum Absorption Power: Using our cal-mag for plants blend with added iron improves uptake efficiency, ensuring these essential minerals are fully utilized. It supports lush vegetative growth and abundant blooms, delivering consistent results for home or commercial growers.
- Reliable Across All Setups: Humboldts Secret cal mag fertilizer with iron works in hydroponics, soil, and container gardens. It strengthens plant structure, enhances fruit quality, and ensures balanced nutrition in indoor and outdoor systems for dependable, healthy harvests.
- Focused on Fruiting Success: Our formula with calcium and magnesium for plants plus chelated iron benefits crops in coco coir or reverse osmosis water. It helps prevent blossom end rot, promotes firm fruit set, and improves nutrient absorption for strong, productive plants in challenging conditions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01GB23TEY |
| Best Sellers Rank | #13,701 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #410 in Garden Fertilizers |
| Brand | Humboldts Secret |
| Brand Name | Humboldts Secret |
| Coverage | Medium |
| Customer Reviews | 4.6 out of 5 stars 2,083 Reviews |
| Item Form | Liquid |
| Item Highlight | Calcium, Magnesium & Chelated Iron Formula, Prevents Nutrient Deficiencies, For Soil, Coco, Hydroponics & RO Water, Easy Mix |
| Liquid Volume | 32 fluid ounces |
| Manufacturer | Humboldts Secret |
| Mixing Ratio | 1-2ml:1000ml for vegetative growth and 2-5ml:1000ml for flowering |
| Model Number | 15195521384514 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | TUEEQE-09 |
| Specific Uses For Product | Hydroponic |
| Target Species | Plants |
| UPC | 648260730390 |
| Unit Count | 32 Fluid Ounces |

## Product Details

- **Brand:** Humboldts Secret
- **Item Form:** Liquid
- **Liquid Volume:** 32 Fluid Ounces
- **Manufacturer:** Humboldts Secret
- **Specific Uses For Product:** Hydroponic

## Images

![Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 32 Ounce - Image 1](https://m.media-amazon.com/images/I/71U35ykO4YL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Awesome product
*by K***R on June 28, 2026*

Awesome stuff, Gonna make it an amazing season!!

### ⭐⭐⭐⭐⭐ Please help me with my light , my Tatu 1000W LED Grow Light
*by N***P on August 31, 2026*

Like

### ⭐⭐⭐⭐⭐ Quickly shows improvement to my house plants. Good company
*by K***O on January 3, 2026*

Had some confusing instructions but their customer service got back to me quickly and cleared confusion. The jug arrived with no leak, has no order and my house plants are happy to get the dose of this fertilizer, especially my old lemon tree which goes out in summer and come in for winter. I notice when plants are healthy not many bugs appear. as it takes very little per gallon of water, it's a good value for the price.

## Frequently Bought Together

- Humboldts Secret Calcium, Magnesium and Iron Supplement – Hydroponic Supplies – Liquid Nutrient Fertilizer – Supports Vegetative and Flowering Stage – 1 Quart
- Humboldts Secret Sweet & Sticky – Carbohydrate and Saccharide Energy Source – Enhance Aroma and Flavor of Plants – Potting Soil for Indoor Plants – Energy for Plants – 32 Ounces
- Humboldts Secret Set of A & B Liquid Hydroponics Fertilizer - World's Best Nutrient System – Hydroponic Nutrients for Outdoor, Indoor Plants – Supports Vegetative and Flowering Stages of Plants

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**Shop now:** [https://www.desertcart.tn/products/42491759-humboldts-secret-calmag-and-iron-liquid-plant-nutrient-fertilizer-32](https://www.desertcart.tn/products/42491759-humboldts-secret-calmag-and-iron-liquid-plant-nutrient-fertilizer-32)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-09-15*