---
product_id: 48892108
title: "Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz)"
brand: "bloom city"
price: "853 Lei"
currency: RON
in_stock: true
reviews_count: 8
url: https://www.desertcart.ro/products/48892108-professional-grade-ultra-pure-cal-mag-growing-fertilizer-gallon-128
store_origin: RO
region: Romania
---

# 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:** 853 Lei
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your garden game with pro-grade Cal-Mag power!

## Quick Answers

- **What is this?** Professional Grade Ultra Pure Cal-Mag Growing Fertilizer,Gallon (128 oz) by bloom city
- **How much does it cost?** 853 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/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

- • **Deficiency Defense:** Prevents blossom end rot & yellow leaves for unstoppable growth
- • **Effortless Integration:** Seamlessly fits any feeding program or foliar spray routine
- • **All-Grow Medium Mastery:** Perfect for soil, coco, peat, or hydroponics—grow without limits
- • **Bioactivated Absorption:** Fulvic acid enhances nutrient uptake at the root level—maximize every drop
- • **Micronutrient Powerhouse:** Loaded with 7+ essential micronutrients for peak plant vitality

## Overview

Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer delivers a scientifically formulated blend of calcium, magnesium, and 7+ essential micronutrients enhanced with fulvic acid for superior nutrient absorption. Designed for all growing mediums and compatible with any feeding program, it prevents common deficiencies like blossom end rot and yellowing leaves, promoting robust stalks and vibrant foliage throughout the entire growth cycle.

## Description

Full description not available

## 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.

## Product Details

- **Brand:** Bloom City
- **Item Weight:** 128 Ounces
- **Item Form:** Liquid
- **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

### ⭐⭐⭐⭐⭐ Powerful fertilizer.
*by P***L on July 13, 2025*

Took a long time to get but I didn’t knock off points from my review for it because this stuff is so powerful. Use it sparingly for certain species. I always half or quarter the doses suggested on the bottle.

### ⭐⭐⭐⭐⭐ No blossom rot
*by P***E on June 12, 2025*

I've used frequently almost daily. Best year I've had avoiding blossom rot on tomatoes. I'll be using it from now on.

### ⭐⭐⭐⭐⭐ 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)/gallonHose end sprayer: 1tsp (5ml) approx 1:750 ratioFoliar spray: 2-4tsp (10-20ml)/gallonOld:Grow phase: 2-4ml/gallonBloom phase: 3-5ml/gallonSprayer instructions: 20-40ml/gallonNot 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.

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-25*