---
product_id: 68378285
title: "Cal-Mag Plus, A Calcium, Magnesium, And Iron Plant Supplement, Corrects Common Plant Deficiencies, Add To Water Or Use As A Spray, 2-0-0 NPK, Quart"
brand: "botanicare"
price: "€ 80.48"
currency: EUR
in_stock: true
reviews_count: 13
category: "Botanicare"
url: https://www.desertcart.gr/products/68378285-cal-mag-plus-a-calcium-magnesium-and-iron-plant-supplement
store_origin: GR
region: Greece
---

# Fortified with Ca, Mg & Fe Mixes easily with water or spray 2-0-0 NPK formula Cal-Mag Plus, A Calcium, Magnesium, And Iron Plant Supplement, Corrects Common Plant Deficiencies, Add To Water Or Use As A Spray, 2-0-0 NPK, Quart

**Brand:** botanicare
**Price:** € 80.48
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your garden game with every drop!

## Quick Answers

- **What is this?** Cal-Mag Plus, A Calcium, Magnesium, And Iron Plant Supplement, Corrects Common Plant Deficiencies, Add To Water Or Use As A Spray, 2-0-0 NPK, Quart by botanicare
- **How much does it cost?** € 80.48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/68378285-cal-mag-plus-a-calcium-magnesium-and-iron-plant-supplement)

## Best For

- botanicare enthusiasts

## Why This Product

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

## Key Features

- • **Trusted Quality:** Backed by 4.7-star reviews and a leading brand in plant nutrition
- • **Growth Amplifier:** Boosts root development and overall plant vigor with every dose
- • **Deficiency Defender:** Corrects calcium, magnesium, and iron shortages for vibrant, healthy plants
- • **Versatile Application:** Use as a foliar spray or mix with every watering for maximum nutrient uptake
- • **Universal Compatibility:** Perfect for soil, coco coir, containers, and hydro gardens alike

## Overview

Botanicare Cal-Mag Plus is a premium liquid plant supplement delivering essential calcium, magnesium, and iron with a balanced 2-0-0 NPK formula. Designed to correct common nutrient deficiencies, it supports robust growth and root development across soil, coco, and hydroponic systems. Easy to apply as a foliar spray or mixed into watering routines, this 32-ounce solution is a must-have for thriving, healthy plants.

## Description

Supplement your existing nutrient programs in reverse osmosis water, or when growing in soil or coco coir-based media, to compensate for a natural calcium draw with Botanicare Cal-Mag Plus. Formulated to correct common deficiencies, Botanicare Cal-Mag Plus is a highly fortified calcium, magnesium, and iron plant supplement. It contains a 2-0-0 NPK and can be mixed in with regular waterings or applied as a foliar spray to further enhance growth.

Review: The "Insurance Policy" for Your Garden - Whether you are a hobbyist with a few houseplants or a professional managing a high-output indoor garden, if you are using Reverse Osmosis (RO) water, Coco Coir, or high-intensity LED lighting, this isn't just an "add-on"—it’s a necessity. Here is the professional breakdown of why this 2-0-0 formula is the gold standard. The Engineering: The "Plus" Makes the Difference Most calcium-magnesium supplements stop at the two namesake minerals. Botanicare’s "Plus" refers to the inclusion of Iron (Fe) and other trace minerals. The Iron Factor: In my 10 years of testing, I’ve found that yellowing leaves (interveinal chlorosis) are often misdiagnosed as just a magnesium deficiency when they are actually an iron lockout. The chelated iron in this formula acts as a catalyst for chlorophyll production, giving your plants that deep "forest green" luster that basic supplements can't match. Bio-Availability: This is a highly soluble, plant-available formula. It doesn't "fall out" of solution or clog emitters in hydroponic systems, which is a common failure in budget-brand minerals. The Versatility: Root Drench vs. Foliar Spray The CT-1's flexibility is its greatest asset. Root Feeding: It buffers the "cation exchange" in Coco Coir perfectly, preventing the medium from "stealing" calcium from your plants. Foliar Rescue: This is the "fast-track." If you see a deficiency starting, you can dilute this as a spray. Because it’s so clean, the leaves absorb it almost instantly, often reversing yellowing in as little as 48 hours. PROS Highly Concentrated: A little goes a long way. The standard dose is only 3–5ml per gallon, meaning this quart will treat hundreds of gallons of water. Corrects "LED Stress": Modern LEDs drive plant metabolism so hard that they often "burn" through calcium and magnesium faster than the base nutrients can provide. This bottle is the solution to that specific 2026 growing problem. Stabilized pH: Unlike some organic-heavy supplements, Cal-Mag Plus is relatively pH-neutral, so it won’t cause wild swings in your reservoir. Universal Compatibility: It works seamlessly with any base nutrient brand (FoxFarm, General Hydroponics, Advanced Nutrients, etc.). Clean Formula: It won't cause "salt crust" buildup on your fabric pots or in your irrigation lines. CONS The 2-0-0 NPK Warning: It contains a small amount of Nitrogen. If you are in the "late bloom" or "ripening" stage of a flowering plant and trying to zero out your nitrogen, you have to be careful not to over-apply this. Not for Low-Light Plants: If your plants are in low-light conditions, they likely don't need this level of supplementation. Over-applying can lead to "nutrient burn" in slow-growing species. Price: It is priced as a premium product, but given the concentration and the included iron, the value is actually superior to "cheap" alternatives. Overall Input Botanicare Cal-Mag Plus is the most reliable tool in my garden. It solves the #1 problem in modern gardening: mineral deficiencies caused by purified water and high-intensity lights. It is a rugged, scientifically sound, and battle-tested formula. If your leaves are turning yellow or your fruit is getting "blossom end rot," this is the cure. Reviewer Pro-Tip: If you are a Coco Coir grower, you should "pre-buffer" your medium with a half-strength solution of this before you ever plant. Also, if you’re using it as a foliar spray, apply it when the lights are about to go off or in the early evening. This prevents the "magnifying glass" effect of water droplets burning your leaves under intense light! Who is this for? Hydroponic growers, Coco Coir enthusiasts, LED indoor gardeners, and anyone struggling with yellowing leaves or stunted growth in their house or vegetable garden.
Review: Great product as always - I recently added Botanicare Cal-Mag Plus to my plant care routine, and I’m really impressed with the results. The product arrived promptly and was excellently packaged, with no leaks or damage to the bottle, which is always a relief when ordering liquid supplements. From the first use, it was clear that this supplement was high quality. It’s easy to measure and mix with my regular nutrient solution. I started using it a few weeks ago, and my plants have shown significant improvement in their overall health and vigor. Cal-Mag Plus is fantastic for addressing common deficiencies in calcium and magnesium, which are crucial for plant growth. Since incorporating it into my routine, I’ve noticed my plants’ leaves are greener and more robust. There are no more signs of yellowing or other deficiency-related issues. This has been particularly beneficial for my tomatoes and peppers, which are heavy feeders and often prone to such deficiencies. Another great aspect of Cal-Mag Plus is its versatility. I use it for both my soil and hydroponic plants, and it integrates seamlessly with my existing nutrient regimen. It doesn’t cause any imbalances or issues, which makes it very convenient. I’ve also observed that my plants are more resilient to stress since I started using this supplement. They seem to handle fluctuations in temperature and light better, and their overall growth has been more vigorous. The added iron in the formula is a nice bonus, contributing to better chlorophyll production and healthier plants. Overall, I’m extremely satisfied with Botanicare Cal-Mag Plus. It’s a reliable, high-quality supplement that has made a noticeable difference in my plants’ health. If you’re dealing with calcium or magnesium deficiencies, or just want to ensure your plants have everything they need to thrive, I highly recommend giving this product a try. It’s become an essential part of my plant care routine, and I’m excited to see continued improvements as I keep using it.

## Features

- Highly fortified calcium, magnesium, and iron plant supplement formulated to correct common deficiencies
- Supplement your existing nutrient program with Cal-Mag Plus
- To Use: Mix well and use with every watering, as needed, for enhanced growth apply as a foliar spray
- For use in containers, coco, hydrogardens, and when growing in soil
- Contains formulation of 2-0-0 NPK

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004JKBMRW |
| Application Method | Spray |
| Best Sellers Rank | #4,624 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #130 in Garden Fertilizers |
| Brand | Botanicare |
| Brand Name | Botanicare |
| Coverage | Full |
| Customer Reviews | 4.7 out of 5 stars 19,691 Reviews |
| Global Trade Identification Number | 00783942912227 |
| Included Components | Gardening^Fertilizer and Soil^fertilizers |
| Item Form | Liquid |
| Item Type Name | Magnesium & Iron Plant Supplement |
| Item Weight | 8 ounces |
| Liquid Volume | 946 ml |
| Manufacturer | Hawthorne Hydroponics, LLC |
| Mixing Ratio | 1:37.8 |
| Model Number | HGC732110 |
| Number of Items | 1 |
| Part Number | BCCMQT |
| Specific Uses For Product | Plant Growth, Root Development, Soil Conditioning |
| Target Species | Plants |
| UPC | 714639456878 757900240325 783942912227 |
| Unit Count | 32.36 Fluid Ounces |
| Warranty Description | 1 year |

## Product Details

- **Brand:** Botanicare
- **Item Form:** Liquid
- **Item Weight:** 8 ounces
- **Liquid Volume:** 946 ml
- **Specific Uses For Product:** Plant Growth, Root Development, Soil Conditioning

## Images

![Cal-Mag Plus, A Calcium, Magnesium, And Iron Plant Supplement, Corrects Common Plant Deficiencies, Add To Water Or Use As A Spray, 2-0-0 NPK, Quart - Image 1](https://m.media-amazon.com/images/I/61FdP-uJxpL.jpg)

## Available Options

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

## Questions & Answers

**Q: How much will this make?**
A: Mixed at 3ml per gallon it will make 320 gallons.
Mixed at 5ml per gallon it will make 192 gallons.

**Q: Is this carbonate based?**
A: Near neutral pH, ferric ions form insoluble solids and are thus not bioavailable. EDTA (and other chelating agents) address this problem, by forming soluble complexes that resist formation of hydroxides. EDTA increases the bioavailability and plant uptake of the metals in the soil

**Q: How long can this be kept and or stored**
A: Product warranty on nutrients and supplements is 1 year past the date of manufacture. Stable shelf life can run past this substantially if unopened, but this time greatly depends on storage conditions. Once a product is opened, it should be used within 6 months, or ideally- the time it takes to cycle a production garden which is typically 12 weeks on average. Opened products may last longer than this, but it should not be expected to be the case.

**Q: Can this be used for Tomatoes, Blossom end rot?**
A: Yes, this works well with Tomatoes.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The "Insurance Policy" for Your Garden
*by M***W on January 4, 2026*

Whether you are a hobbyist with a few houseplants or a professional managing a high-output indoor garden, if you are using Reverse Osmosis (RO) water, Coco Coir, or high-intensity LED lighting, this isn't just an "add-on"—it’s a necessity. Here is the professional breakdown of why this 2-0-0 formula is the gold standard. The Engineering: The "Plus" Makes the Difference Most calcium-magnesium supplements stop at the two namesake minerals. Botanicare’s "Plus" refers to the inclusion of Iron (Fe) and other trace minerals. The Iron Factor: In my 10 years of testing, I’ve found that yellowing leaves (interveinal chlorosis) are often misdiagnosed as just a magnesium deficiency when they are actually an iron lockout. The chelated iron in this formula acts as a catalyst for chlorophyll production, giving your plants that deep "forest green" luster that basic supplements can't match. Bio-Availability: This is a highly soluble, plant-available formula. It doesn't "fall out" of solution or clog emitters in hydroponic systems, which is a common failure in budget-brand minerals. The Versatility: Root Drench vs. Foliar Spray The CT-1's flexibility is its greatest asset. Root Feeding: It buffers the "cation exchange" in Coco Coir perfectly, preventing the medium from "stealing" calcium from your plants. Foliar Rescue: This is the "fast-track." If you see a deficiency starting, you can dilute this as a spray. Because it’s so clean, the leaves absorb it almost instantly, often reversing yellowing in as little as 48 hours. PROS Highly Concentrated: A little goes a long way. The standard dose is only 3–5ml per gallon, meaning this quart will treat hundreds of gallons of water. Corrects "LED Stress": Modern LEDs drive plant metabolism so hard that they often "burn" through calcium and magnesium faster than the base nutrients can provide. This bottle is the solution to that specific 2026 growing problem. Stabilized pH: Unlike some organic-heavy supplements, Cal-Mag Plus is relatively pH-neutral, so it won’t cause wild swings in your reservoir. Universal Compatibility: It works seamlessly with any base nutrient brand (FoxFarm, General Hydroponics, Advanced Nutrients, etc.). Clean Formula: It won't cause "salt crust" buildup on your fabric pots or in your irrigation lines. CONS The 2-0-0 NPK Warning: It contains a small amount of Nitrogen. If you are in the "late bloom" or "ripening" stage of a flowering plant and trying to zero out your nitrogen, you have to be careful not to over-apply this. Not for Low-Light Plants: If your plants are in low-light conditions, they likely don't need this level of supplementation. Over-applying can lead to "nutrient burn" in slow-growing species. Price: It is priced as a premium product, but given the concentration and the included iron, the value is actually superior to "cheap" alternatives. Overall Input Botanicare Cal-Mag Plus is the most reliable tool in my garden. It solves the #1 problem in modern gardening: mineral deficiencies caused by purified water and high-intensity lights. It is a rugged, scientifically sound, and battle-tested formula. If your leaves are turning yellow or your fruit is getting "blossom end rot," this is the cure. Reviewer Pro-Tip: If you are a Coco Coir grower, you should "pre-buffer" your medium with a half-strength solution of this before you ever plant. Also, if you’re using it as a foliar spray, apply it when the lights are about to go off or in the early evening. This prevents the "magnifying glass" effect of water droplets burning your leaves under intense light! Who is this for? Hydroponic growers, Coco Coir enthusiasts, LED indoor gardeners, and anyone struggling with yellowing leaves or stunted growth in their house or vegetable garden.

### ⭐⭐⭐⭐⭐ Great product as always
*by R***K on June 21, 2024*

I recently added Botanicare Cal-Mag Plus to my plant care routine, and I’m really impressed with the results. The product arrived promptly and was excellently packaged, with no leaks or damage to the bottle, which is always a relief when ordering liquid supplements. From the first use, it was clear that this supplement was high quality. It’s easy to measure and mix with my regular nutrient solution. I started using it a few weeks ago, and my plants have shown significant improvement in their overall health and vigor. Cal-Mag Plus is fantastic for addressing common deficiencies in calcium and magnesium, which are crucial for plant growth. Since incorporating it into my routine, I’ve noticed my plants’ leaves are greener and more robust. There are no more signs of yellowing or other deficiency-related issues. This has been particularly beneficial for my tomatoes and peppers, which are heavy feeders and often prone to such deficiencies. Another great aspect of Cal-Mag Plus is its versatility. I use it for both my soil and hydroponic plants, and it integrates seamlessly with my existing nutrient regimen. It doesn’t cause any imbalances or issues, which makes it very convenient. I’ve also observed that my plants are more resilient to stress since I started using this supplement. They seem to handle fluctuations in temperature and light better, and their overall growth has been more vigorous. The added iron in the formula is a nice bonus, contributing to better chlorophyll production and healthier plants. Overall, I’m extremely satisfied with Botanicare Cal-Mag Plus. It’s a reliable, high-quality supplement that has made a noticeable difference in my plants’ health. If you’re dealing with calcium or magnesium deficiencies, or just want to ensure your plants have everything they need to thrive, I highly recommend giving this product a try. It’s become an essential part of my plant care routine, and I’m excited to see continued improvements as I keep using it.

### ⭐⭐⭐⭐⭐ I've used this products for quiet a while and it's a must have.
*by M***. on March 9, 2026*

Great all around plant nutrient that helps plants stay green and healthy . Of course one can deduce that if you are that far into botany and horticulture you have a grasp on the importance of this nutrient is . Very easy to use I use 5 mills or a teaspoon per gallon weekly . Helps the plants reach their full potential and avoid nutrient lockouts if used correctly.

## Frequently Bought Together

- Botanicare Cal-Mag Plus, A Calcium, Magnesium, And Iron Plant Supplement, Corrects Common Plant Deficiencies, Add To Water Or Use As A Spray, 2-0-0 NPK, Quart
- Botanicare Hydroplex, Bloom Enhancer, 0-10-6, 1 gal.

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-10-10*