---
product_id: 745469293
title: "Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, 1/2 Pint (8 oz)"
brand: "bloom city"
price: "€ 46.83"
currency: EUR
in_stock: true
reviews_count: 5
category: "Bloom City"
url: https://www.desertcart.hr/products/745469293-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer
store_origin: HR
region: Croatia
---

# Calcium & Magnesium boost for vibrant, sturdy plants Ultra-pure liquid formula for easy absorption Versatile use: soil, hydroponics, indoor & outdoor Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, 1/2 Pint (8 oz)

**Brand:** bloom city
**Price:** € 46.83
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your plant game with pure Cal-Mag power—because your garden deserves the best!

## Quick Answers

- **What is this?** Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, 1/2 Pint (8 oz) by bloom city
- **How much does it cost?** € 46.83 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/745469293-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

- • **Trusted by Experts:** Preferred by gardeners who demand quality and consistent growth
- • **Nutrient Powerhouse:** Calcium & magnesium combo supports strong stems & lush leaves
- • **Visible Results Fast:** Plants recover and thrive within days—don’t let deficiencies hold you back
- • **Effortless Integration:** Just 2-5ml per gallon—simple dosing for busy pros
- • **Universal Compatibility:** Perfect for all plant types and growing methods, from houseplants to hydroponics

## Overview

Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer delivers essential calcium and magnesium in a highly absorbable liquid form. Designed for all growing environments—indoor, outdoor, soil, or hydroponic—this 8 oz bottle offers precise dosing to support strong stems, vibrant foliage, and overall plant health. Ideal for gardeners of any skill level, it quickly addresses nutrient deficiencies and promotes consistent growth, making it a must-have for thriving plants.

## Description

Looking for a simple way to support your plants' growth? Our liquid Cal Mag for plants provides calcium and magnesium, key nutrients that plants use to maintain sturdy stems and vibrant foliage. Whether you're caring for a home garden, growing indoors, or tending to an outdoor landscape, this CalMag for plants works well in various growing environments, including soil and hydroponic systems. Many growers choose Cal Mag for plants to address potential nutrient imbalances, which may affect growth and appearance. This Cal Mag fertilizer is an easy way to include vital nutrients in your plant care routine, helping you nurture your plants with ease. It is an ideal option for growers looking to support healthy and beautiful plants.

Review: 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.
Review: 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.

## 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 | B08JHFG5GH |
| Manufacturer | Bloom City |
| Manufacturer reference | BCALMAG8OZ |
| Package Dimensions | 15.7 x 5 x 4.9 cm; 226.8 g |

## Product Details

- **Brand:** Bloom City
- **Item form:** Liquid
- **Item weight:** 8 Ounces
- **Liquid volume:** 0.5 Pints
- **Specific uses for product:** Organic

## Images

![Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer, 1/2 Pint (8 oz) - Image 1](https://m.media-amazon.com/images/I/61E0Mp9CLRL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by G***E on 12 June 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.

### ⭐⭐⭐⭐⭐ Review
*by M***Y on 18 September 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.

### ⭐⭐⭐⭐⭐ Review
*by W***R on 9 October 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, 1/2 Pint (8 oz)
- Bloom City Organic Liquid Seaweed and Kelp Fertilizer Supplement, (8 oz) Concentrated Makes 45 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.hr/products/745469293-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer](https://www.desertcart.hr/products/745469293-bloom-city-professional-grade-ultra-pure-cal-mag-growing-fertilizer)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-03*