---
product_id: 48918090
title: "CAL-MAG"
brand: "bloom city"
price: "$95"
currency: NZD
in_stock: null
reviews_count: 8
category: "Bloom City"
url: https://www.desertcart.nz/products/48918090-cal-mag
store_origin: NZ
region: New Zealand
---

# Calcium & Magnesium for vibrant growth 32 fl oz liquid for easy dosing 2-5 ml per gallon precise mixing CAL-MAG

**Brand:** bloom city
**Price:** $95
**Availability:** ❌ Out of Stock

## Summary

> 🌱 Unlock your plants’ full potential with every drop!

## Quick Answers

- **What is this?** CAL-MAG by bloom city
- **How much does it cost?** $95 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/48918090-cal-mag)

## Best For

- bloom city enthusiasts

## Why This Product

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

## Key Features

- • **Dual Mineral Power:** Calcium and magnesium combine to strengthen stems and enhance leaf vibrancy.
- • **Trusted by Thousands:** 4.6-star rating from 6,700+ users proves it’s a must-have for thriving plants.
- • **Universal Plant Care:** Perfect for indoor, outdoor, and hydroponic setups—grow anywhere with confidence.
- • **Beginner-Friendly Formula:** Easy integration into any routine, whether you’re a novice or a seasoned gardener.
- • **Effortless Nutrient Boost:** Just 2-5 ml per gallon—simple, no-fuss feeding for all plants.

## Overview

Bloom City’s Cal-Mag is a professional-grade liquid fertilizer delivering essential calcium and magnesium in a convenient 32 oz bottle. Designed for all plant types and growing methods, it supports strong stems and vibrant leaves with an easy 2-5 ml per gallon mixing ratio. Highly rated by thousands, this organic formula is a reliable nutrient boost for gardeners seeking consistent, healthy growth indoors or out.

## Description

desertcart.com : Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz) : Patio, Lawn & Garden

Review: Calcium magnesium fertilizer - I grow bell peppers and other types of peppers in my garden. Sometimes they need calcium and magnesium to fertilize them or they start getting the source fights on them. I decided to try this one to see if it would work. I use this and within a week, my plants perked up really well. The pepper started looking very nice and green and healthy. I’m very satisfied with this product. I would suggest this for anybody this fertilizer is good quality it’s effective and being organic makes it even better.
Review: Great for correcting nutrient deficiencies - This is the only general micronutrient supplement I ever buy. I first got it when my younger plants started showing signs of nutrient deficiencies outside of NPK nutrients. My plants showed signs of recovery after one watering and a few foliar applications. Some people might not need it, especially if they are growing in properly enriched soil, but I have water that's softened at a municipal level. As a result, some minerals have been removed from my water; this product helps restore those and add others that are good for all plant growth stages, from new plants to blooming plants. Use is simple. Just measure out however much I want to add to my 2-gallon can, dump it in, add water, and water my plants as usual. No worrying about presoaking anything or lots of stirring to mix in powders. (for simplicity, I use a different fertilizer bottle's cap to measure out ~8ml when filling my watering can) The bottle cap/lid and recommended measurements have changed from the previous bottle I bought. The ingredients list is the same, as well as the concentration percentages of the minerals. They also separate the use guidelines/directions differently between them. I'll only mention the amount differences. New: watering can: 1tsp (2.5-5ml)/gallon Hose end sprayer: 1tsp (5ml) approx 1:750 ratio Foliar spray: 2-4tsp (10-20ml)/gallon Old: Grow phase: 2-4ml/gallon Bloom phase: 3-5ml/gallon Sprayer instructions: 20-40ml/gallon Not sure why they changed the amounts, but it's helpful to know the ratio for using with a hose end sprayer. Overall, great value for money in my opinion.

## Features

- Easy Mixing Directions: Simply add 2-5ml per gallon of feedwater, then water your plants as you normally would. A straightforward addition to your plant care routine, suited for all types of plants.
- Nutrient-Focused Formula: This Cal Mag fertilizer contains calcium and magnesium that plants use for maintaining strong stems and vibrant leaves. Suitable for both indoor and outdoor use.
- Adaptable for Different Growers: Whether tending to houseplants, outdoor gardens, or hydroponic setups, this CalMag for plants fits into a variety of growing conditions and plant care styles.
- Supports Plant Nutrition: Many gardeners turn to Cal Mag for plants to help address nutrient needs, aiming to support consistent growth and leaf color, linked to calcium and magnesium intake.
- Suitable for Growers of Any Skill Level: From beginners to experienced gardeners, this Cal Mag fertilizer is easy to integrate into any plant care routine, providing essential nutrients in an accessible format.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B073ZNQWCM |
| Best Sellers Rank | #3,784 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #154 in Garden Fertilizers |
| Brand | Bloom City |
| Brand Name | Bloom City |
| Coverage | Full |
| Customer Reviews | 4.6 out of 5 stars 6,773 Reviews |
| Item Form | Liquid |
| Item Weight | 32 Ounces |
| Liquid Volume | 32 Fluid Ounces |
| Manufacturer | Bloom City |
| Mixing Ratio | x mL per 1 gallon of water |
| Specific Uses For Product | Organic |
| Target Species | plants |
| UPC | 841401125141 |
| Unit Count | 32 Fluid Ounces |

## Product Details

- **Brand:** Bloom City
- **Item Weight:** 32 Ounces
- **Item Form:** Liquid
- **Liquid Volume:** 32 Fluid Ounces
- **Specific Uses For Product:** Organic

## Images

![CAL-MAG - Image 1](https://m.media-amazon.com/images/I/71w95RGYnrL.jpg)

## Available Options

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

## Questions & Answers

**Q: Is there nitrogen in this?  It would be helpful for the seller to post the bottle back side label.**
A: Hey there, good idea on posting the labels, adding that to my to-do list!  To answer your question, yes there is Nitrogen.  Here is the guaranteed analysis of nutrient content on our Cal-Mag.  Total Nitrogen 2%, 2% Nitrate Nitrogen, Calcium 2%, Magnesium 0.6%, Boron .002%, Copper .003%, iron .004%, Manganese .004%, Zinc .004%.  Derived from: Calcium Nitrate, Magnesium Nitrate, Boric Acid, Copper Sulfate, Ferric Sulfate, Manganese Sulfate, Zinc Sulfate.

Hope that helps!

James - Bloom City Crew

**Q: Site says it is compatible with all  growth mediums, but bottle says for hydroponic use ONLY. Which is it?**
A: That terminology on the bottle is unfortunately a labeling requirement placed on us by regulators.  It is compatible with all growing mediums, including soil, cocoa coir, peat, hydroponic systems, etc.  

Thanks,
James - Bloom City Crew

**Q: Can this be mixed with epsom salt for additional magnesium as a foliar spray or added as a root drench?**
A: Hi, Great question.  It can be added to epsom salt in a water solution, however we suggest you try this Cal-Mag first on the plants - its probably more than enough magnesium.  We use highly bio-available mineral forms and add organic acids to the product to increase uptake.  Its also great as both a foliar spray and a root drench!  Let us know how the plants grow!

**Q: What would be the salt in ppm per dose added to ro or distilled water?**
A: Hi, thanks for the question!  The PPM added would be about 120 for the low dose of 2ml per gallon, and 240 for the high dose of 4ml per gallon.  Let us know if you have any other questions!

James - Bloom City Crew

## Customer Reviews

### ⭐⭐⭐⭐⭐ Calcium magnesium fertilizer
*by M***Y on September 18, 2025*

I grow bell peppers and other types of peppers in my garden. Sometimes they need calcium and magnesium to fertilize them or they start getting the source fights on them. I decided to try this one to see if it would work. I use this and within a week, my plants perked up really well. The pepper started looking very nice and green and healthy. I’m very satisfied with this product. I would suggest this for anybody this fertilizer is good quality it’s effective and being organic makes it even better.

### ⭐⭐⭐⭐⭐ Great for correcting nutrient deficiencies
*by G***E on June 12, 2025*

This is the only general micronutrient supplement I ever buy. I first got it when my younger plants started showing signs of nutrient deficiencies outside of NPK nutrients. My plants showed signs of recovery after one watering and a few foliar applications. Some people might not need it, especially if they are growing in properly enriched soil, but I have water that's softened at a municipal level. As a result, some minerals have been removed from my water; this product helps restore those and add others that are good for all plant growth stages, from new plants to blooming plants. Use is simple. Just measure out however much I want to add to my 2-gallon can, dump it in, add water, and water my plants as usual. No worrying about presoaking anything or lots of stirring to mix in powders. (for simplicity, I use a different fertilizer bottle's cap to measure out ~8ml when filling my watering can) The bottle cap/lid and recommended measurements have changed from the previous bottle I bought. The ingredients list is the same, as well as the concentration percentages of the minerals. They also separate the use guidelines/directions differently between them. I'll only mention the amount differences. New: watering can: 1tsp (2.5-5ml)/gallon Hose end sprayer: 1tsp (5ml) approx 1:750 ratio Foliar spray: 2-4tsp (10-20ml)/gallon Old: Grow phase: 2-4ml/gallon Bloom phase: 3-5ml/gallon Sprayer instructions: 20-40ml/gallon Not sure why they changed the amounts, but it's helpful to know the ratio for using with a hose end sprayer. Overall, great value for money in my opinion.

### ⭐⭐⭐⭐⭐ Works as advertised
*by W***R on October 9, 2025*

I initially got this for my raised garden tomatoes. When I noticed my bell pepper plants in growbags were experiencing end rot, I used this on them. Probably 2 doses in a month. From that point forward, it cured the end rot in the new bells. Seemed to act quick and I haven't had the need to add anymore this season. This was great to have on hand. Would order again.

## Frequently Bought Together

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-01-24*