--- product_id: 48892108 title: "Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon)" brand: "bloom city" price: "R3824" currency: ZAR in_stock: true reviews_count: 8 category: "Bloom City" url: https://www.desertcart.co.za/products/48892108-professional-grade-ultra-pure-cal-mag-fertilizer-1-gallon store_origin: ZA region: South Africa --- # Boosts Calcium & Magnesium Uptake Top #103 Garden Fertilizer 1 Gallon Ultra-Pure Liquid Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon) **Brand:** bloom city **Price:** R3824 **Availability:** ✅ In Stock ## Summary > 🌿 Elevate your garden game with ultra-pure Cal-Mag power! ## Quick Answers - **What is this?** Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon) by bloom city - **How much does it cost?** R3824 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/48892108-professional-grade-ultra-pure-cal-mag-fertilizer-1-gallon) ## 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 - • **Precision Dosing:** Easy-to-use liquid with tailored mixing ratios for vegetative and bloom stages. - • **Trusted & Proven:** Highly rated (#103 in Garden Fertilizers) with 4.6-star reviews from thousands of growers. - • **Deficiency Defense:** Effectively reduces blossom end rot and corrects nutrient gaps. - • **Pure Power for Peak Growth:** Ultra-pure Cal-Mag formula fuels robust plant development and resilience. - • **Versatile for Soil & Hydroponics:** Optimized for both soil gardens and cutting-edge hydroponic systems. ## Overview Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer is a 1-gallon liquid nutrient solution designed to enhance plant strength and growth by supplying essential calcium and magnesium. Suitable for both soil and hydroponic systems, it helps prevent blossom end rot and improves nutrient uptake efficiency. Trusted by thousands with a 4.6-star rating, it supports a wide range of plants including vegetables, fruits, and houseplants. ## Description desertcart.com : Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon) | Helps Reduce Blossom End Rot, Corrects Deficiencies, Boost Calcium Uptake, Made for Hydro & Soil, Supports Tomatoes & Peppers : Patio, Lawn & Garden Review: Best plant fertilizer - I’ve been using the Bloom City Professional Grade Ultra Pure Cal-Mag (32 oz) for my plants, and I’m very impressed with the results. It’s made a noticeable difference in overall plant health—especially with preventing calcium and magnesium deficiencies that can show up as yellowing leaves or weak growth. The formula is clean and easy to mix, and a little goes a long way. I’ve used it with both soil and hydro setups, and it works great across the board. My plants look greener, stronger, and more vibrant since adding this to my routine. Another big plus is that it doesn’t cause buildup or clogging in my system, which I’ve had issues with in the past when using other brands. If you’re growing vegetables, houseplants, or anything that needs that extra nutrient boost, this is definitely worth trying. Reliable quality and consistent results. I'll be buying again! Review: Great product! - Did wonders for my plants! Will definitely purchase again. ## Features - Calcium & Magnesium Growing Support – Formulated to supply essential nutrients for active plant growth. - Supports Plant Strength & Development – Helps encourage sturdy structure and steady growth. - Improves Nutrient Uptake Efficiency – Supports balanced feeding and overall plant performance. - Ideal for Soil & Hydroponic Systems – Suitable for indoor plants, gardens, and hydroponic growing. - Made in USA ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B073ZP47ZN | | Best Sellers Rank | #4,476 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #121 in Garden Fertilizers | | Brand | Bloom City | | Brand Name | Bloom City | | Coverage | Full | | Customer Reviews | 4.6 out of 5 stars 6,976 Reviews | | Item Form | Liquid | | Item Highlight | Helps Reduce Blossom End Rot, Corrects Deficiencies, Boost Calcium Uptake, Made for Hydro & Soil, Supports Tomatoes & Peppers | | Item Weight | 8 pounds | | Liquid Volume | 1 gallons | | Manufacturer | Bloom City | | Mixing Ratio | 2-4 mL per gallon (vegetative stage), 3-5 mL per gallon (bloom) | | Model Number | Cal-Mag UltraPure | Plus Micros | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | BCALMAG1G | | Specific Uses For Product | Plant Growth | | Target Species | Houseplants, Greenhouse Plants, Edible Plants (fruits and veggies), Trees, Turf | | UPC | 841401125158 | | Unit Count | 128 Ounce | ## Product Details - **Brand:** Bloom City - **Item Form:** Liquid - **Item Weight:** 8 pounds - **Liquid Volume:** 1 gallons - **Specific Uses For Product:** Plant Growth ## Images ![Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon) - 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 ### ⭐⭐⭐⭐⭐ Best plant fertilizer *by J***W on March 26, 2026* I’ve been using the Bloom City Professional Grade Ultra Pure Cal-Mag (32 oz) for my plants, and I’m very impressed with the results. It’s made a noticeable difference in overall plant health—especially with preventing calcium and magnesium deficiencies that can show up as yellowing leaves or weak growth. The formula is clean and easy to mix, and a little goes a long way. I’ve used it with both soil and hydro setups, and it works great across the board. My plants look greener, stronger, and more vibrant since adding this to my routine. Another big plus is that it doesn’t cause buildup or clogging in my system, which I’ve had issues with in the past when using other brands. If you’re growing vegetables, houseplants, or anything that needs that extra nutrient boost, this is definitely worth trying. Reliable quality and consistent results. I'll be buying again! ### ⭐⭐⭐⭐⭐ Great product! *by D***T on August 4, 2026* Did wonders for my plants! Will definitely purchase again. ### ⭐⭐⭐⭐⭐ Great product will buy again *by L***I on July 15, 2026* This took care of blossom end rot on my tomatoes really quickly, I will be using this every year, hurray…big beautiful tomatoes! ## 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.co.za/products/48892108-professional-grade-ultra-pure-cal-mag-fertilizer-1-gallon](https://www.desertcart.co.za/products/48892108-professional-grade-ultra-pure-cal-mag-fertilizer-1-gallon) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-10-12*