---
product_id: 48918090
title: "Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz)"
brand: "bloom city"
price: "6697 kr"
currency: ISK
in_stock: true
reviews_count: 8
category: "Bloom City"
url: https://www.desertcart.is/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer
store_origin: IS
region: Iceland
---

# Balanced Ca & Mg blend for vibrant, strong plants Ultra-pure liquid formula for easy absorption Precise dosing: 2-5ml per gallon for tailored feeding Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz)

**Brand:** bloom city
**Price:** 6697 kr
**Availability:** ✅ In Stock

## Summary

> 🌱 Feed your plants like a pro—because thriving is the new trend!

## Quick Answers

- **What is this?** Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz) by bloom city
- **How much does it cost?** 6697 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer)

## 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

- • **Effortless Integration:** Simple 2-5ml per gallon dosing fits seamlessly into any watering routine—no guesswork, no hassle.
- • **Versatile Growth Support:** Perfect for indoor, outdoor, and hydroponic setups—your all-in-one nutrient boost for every plant environment.
- • **Strength & Vitality Boost:** Calcium and magnesium work in tandem to fortify stems and enhance leaf vibrancy, ensuring your plants stand out.
- • **Nutrient Deficiency Savior:** Quickly addresses calcium and magnesium gaps, reviving plants to lush, healthy growth that neighbors will envy.
- • **Universal Gardener’s Ally:** Whether you’re a rookie or a seasoned green thumb, this formula is designed for easy, effective use at every skill level.

## Overview

Bloom City’s Professional Grade Ultra Pure Cal-Mag Fertilizer delivers a precise liquid formula packed with calcium and magnesium to strengthen stems and boost leaf color. Designed for all growing styles—from houseplants to hydroponics—this easy-to-use 32 oz bottle ensures consistent nutrient support, helping gardeners of all levels prevent deficiencies and promote vibrant, healthy plants.

## 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 | #4,972 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #188 in Garden Fertilizers |
| Brand | Bloom City |
| Date First Available | July 17, 2017 |
| Item Form | Liquid |
| Item Weight | 2 pounds |
| Liquid Volume | 32 Fluid Ounces |
| Manufacturer | Bloom City |
| Number of Items | 1 |
| Package Dimensions | 8.82 x 3.27 x 3.11 inches |
| Specific Uses For Product | Organic |
| UPC | 841401125141 |
| Unit Count | 32 Fluid Ounces |

## Product Details

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

## Images

![Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz) - 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

- Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, Quart (32 oz)
- Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, Quart (32 oz) Concentrated Makes 180 Gallons
- Bloom City Liquid Silica Boost Fertilizer and Supplement, 1/2 Pint (8 oz) Concentrated Makes 45 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.is/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer](https://www.desertcart.is/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer)

---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-15*