---
product_id: 68507987
title: "CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon"
brand: "humboldts secret"
price: "€ 190.94"
currency: EUR
in_stock: true
category: "Humboldts Secret"
url: https://www.desertcart.hr/products/68507987-calmag-and-iron-liquid-plant-nutrient-fertilizer-1-gallon
store_origin: HR
region: Croatia
---

# Fast-acting nutrient recovery Calcium, Magnesium & Chelated Iron blend 128 fl oz liquid formula CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon

**Brand:** humboldts secret
**Price:** € 190.94
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon by humboldts secret
- **How much does it cost?** € 190.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/68507987-calmag-and-iron-liquid-plant-nutrient-fertilizer-1-gallon)

## 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 Formula:** Revives stressed plants fast for lush growth and vibrant blooms
- • **Fruiting & Flowering Focus:** Prevents blossom end rot and promotes firm, abundant harvests
- • **Maximized Mineral Absorption:** Chelated iron ensures every drop fuels your plants’ potential
- • **Universal Garden Compatibility:** Perfect for soil, hydroponics, coco coir & RO water setups
- • **Power-Packed 3-in-1 Nutrient Boost:** Calcium, Magnesium & Iron for unstoppable plant vitality

## Overview

Humboldts Secret CalMag & Iron is a premium 1-gallon liquid fertilizer delivering a balanced blend of calcium, magnesium, and chelated iron. Designed for fast absorption and versatile use across soil, hydroponics, coco coir, and RO water systems, it prevents nutrient deficiencies, strengthens plant structure, and enhances flowering and fruiting for healthier, more productive plants.

## Description

desertcart.com : Humboldts Secret CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon | Calcium, Magnesium & Chelated Iron Formula, Prevents Nutrient Deficiencies, For Soil, Coco, Hydroponics & RO Water, Easy Mix : Patio, Lawn & Garden

## 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 | B01GB23TD0 |
| Application Method | soil drench or foliar spray |
| Best Sellers Rank | #21,549 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #616 in Garden Fertilizers |
| Brand Name | Humboldts Secret |
| Coverage | Medium |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,085) |
| Global Trade Identification Number | 00648260730406 |
| Item Form | Liquid |
| Item Highlight | Calcium, Magnesium & Chelated Iron Formula, Prevents Nutrient Deficiencies, For Soil, Coco, Hydroponics & RO Water, Easy Mix |
| Liquid Volume | 128 fluid ounces |
| Manufacturer | Humboldts Secret |
| Mixing Ratio | 2-5 ml/gallon |
| Model Number | CalMag & Iron |
| Number of Packs | 1 |
| Part Number | TUEEQE-06 |
| Specific Uses For Product | Hydroponic |
| Target Species | flowering plants |
| UPC | 648260730406 |
| Unit Count | 128 Fluid Ounces |

## Product Details

- **Brand:** Humboldts Secret
- **Global Trade Identification Number:** 00648260730406
- **Item Form:** Liquid
- **Liquid Volume:** 128 fluid ounces
- **Specific Uses For Product:** Hydroponic

## Images

![CalMag & Iron, Liquid Plant Nutrient Fertilizer, 1 Gallon - Image 1](https://m.media-amazon.com/images/I/71E5ugjm48L.jpg)

## Available Options

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

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**Shop now:** [https://www.desertcart.hr/products/68507987-calmag-and-iron-liquid-plant-nutrient-fertilizer-1-gallon](https://www.desertcart.hr/products/68507987-calmag-and-iron-liquid-plant-nutrient-fertilizer-1-gallon)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-16*