---
product_id: 48892108
title: "Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz)"
brand: "bloom city"
price: "$270"
currency: NZD
in_stock: true
reviews_count: 8
category: "Bloom City"
url: https://www.desertcart.nz/products/48892108-professional-grade-ultra-pure-cal-mag-growing-fertilizer-gallon-128
store_origin: NZ
region: New Zealand
---

# Balanced Ca & Mg boost Universal medium compatibility Micro-chelated fulvic acid Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz)

**Brand:** bloom city
**Price:** $270
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your garden game with pro-grade purity and unstoppable growth!

## Quick Answers

- **What is this?** Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz) by bloom city
- **How much does it cost?** $270 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/48892108-professional-grade-ultra-pure-cal-mag-growing-fertilizer-gallon-128)

## 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

- • **All-Phase Support:** Optimized dosing for both Grow and Bloom phases to maximize yield.
- • **Deficiency Defense:** Prevents blossom end rot & yellowing leaves for visibly healthier plants.
- • **Effortless Integration:** Seamlessly fits any feeding program—soil, hydro, coco, or peat.
- • **Bioactivated Absorption:** Fulvic acid enhances root uptake for maximum nutrient efficiency.
- • **Micronutrient Powerhouse:** Packed with 7+ essential micronutrients beyond standard Cal-Mag formulas.

## Overview

Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer delivers a scientifically crafted blend of calcium, magnesium, and 7+ bioavailable micronutrients enhanced with fulvic acid. Designed for all growing mediums and phases, it prevents common nutrient deficiencies while promoting robust stalks and vibrant foliage. Easy to use and compatible with any feeding system, this 128 oz gallon is a must-have for serious growers seeking consistent, lush results.

## Description

desertcart.com : Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 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

- Boosts Plant Health & Prevents Deficiencies: Formulated to prevent common issues like blossom end rot and yellowing leaves. Promotes strong stalk development and lush, vibrant leaf growth by supplying a balanced dose of calcium, magnesium, and key micronutrients
- Packed with Bioavailable Micronutrients: Contains a wider array of essential micronutrients than other Cal-Mag products, including Iron (Fe), Zinc (Zn), Boron (B), Copper (Cu), Manganese (Mn), Molybdenum (Mo), and Sulfur (S) for overall plant vitality and productivity.
- Bioactivated Formula with Fulvic Acid: Micro-chelated with fulvic acid to enhance nutrient uptake and absorption at the root level. Scientifically crafted for maximum bioavailability, ensuring your plants get the most out of every dose.
- Easy to Use with Any Feeding Program: Add to feedwater: Use 2–4 mL per gallon during the Grow Phase and 3–5 mL per gallon during the Bloom Phase. Also works as a foliar spray: use 10–20 mL per gallon, 1–2 times weekly. Compatible with all nutrient systems and growing methods.
- Made for All Grow Mediums: Versatile formula works in all mediums: Soil, Coco, Peat, or Hydroponics. Safe for all plant types and ideal for use throughout the entire growth cycle.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B073ZP47ZN |
| Best Sellers Rank | #4,623 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #196 in Garden Fertilizers |
| Brand | Bloom City |
| Date First Available | August 26, 2019 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Weight | 8 pounds |
| Item model number | Cal-Mag UltraPure | Plus Micros |
| Liquid Volume | 1 Gallons |
| Manufacturer | Bloom City |
| Number of Items | 1 |
| Package Dimensions | 11.85 x 6.14 x 6.1 inches |
| UPC | 841401125158 |
| Unit Count | 128 Ounce |

## Product Details

- **Brand:** Bloom City
- **Item Form:** Liquid
- **Item Weight:** 128 Ounces
- **Liquid Volume:** 1 Gallons
- **Manufacturer:** Bloom City

## Images

![Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz) - Image 1](https://m.media-amazon.com/images/I/61BOCBiCtuL.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

- Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz)
- Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement (128 oz) Concentrated Makes 750 Gallons
- Bloom City Liquid Silica Boost Fertilizer and Supplement, Gallon (128 oz) Concentrated Makes 750 Gallons

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.nz/products/48892108-professional-grade-ultra-pure-cal-mag-growing-fertilizer-gallon-128](https://www.desertcart.nz/products/48892108-professional-grade-ultra-pure-cal-mag-growing-fertilizer-gallon-128)

---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-18*