--- product_id: 48918090 title: "CAL-MAG" brand: "bloom city" price: "€ 68.69" currency: EUR in_stock: true reviews_count: 8 category: "Bloom City" url: https://www.desertcart.at/products/48918090-cal-mag store_origin: AT region: Austria --- # Calcium + Magnesium for vibrant growth 32 oz ultra-pure liquid formula 2-5ml per gallon easy dosing CAL-MAG **Brand:** bloom city **Price:** € 68.69 **Availability:** ✅ In Stock ## Summary > 🌱 Elevate your plant game with pure power—because your garden deserves the best! ## Quick Answers - **What is this?** CAL-MAG by bloom city - **How much does it cost?** € 68.69 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/48918090-cal-mag) ## 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:** Effectively reduces blossom end rot and corrects nutrient gaps for healthier plants. - • **Ultra-Pure Formula:** Professional-grade calcium and magnesium to strengthen stems and enhance leaf vibrancy. - • **Trusted by Thousands:** 4.6-star rating from nearly 7,000 gardeners who swear by its reliable results. - • **Versatile Application:** Perfect for soil, hydroponics, indoor, and outdoor plants—one solution for all growers. - • **Precision Nutrient Boost:** Easily mix 2-5ml per gallon for consistent, hassle-free feeding. ## Overview Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer is a 32 oz liquid nutrient solution designed to deliver essential calcium and magnesium for stronger stems, vibrant leaves, and reduced blossom end rot. Suitable for all growing methods including soil and hydroponics, it offers easy dosing with 2-5ml per gallon of water. Trusted by thousands of gardeners, this formula supports consistent plant health and growth across a wide variety of plants. ## Description desertcart.com : Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (32 oz) | Helps Reduce Blossom End Rot, Corrects Deficiencies, Boost Calcium Uptake, Made for Hydro & Soil, Supports Tomatoes & Peppers : Patio, Lawn & Garden Review: Great product! - Did wonders for my plants! Will definitely purchase again. 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! ## 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 | | Application Method | Watered-in fertilizer and foliar spray | | Best Sellers Rank | #3,947 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #124 in Garden Fertilizers | | Brand | Bloom City | | Brand Name | Bloom City | | Coverage | Full | | Customer Reviews | 4.6 out of 5 stars 6,967 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 | 2 pounds | | Liquid Volume | 32 fluid ounces | | Manufacturer | Bloom City | | Mixing Ratio | x mL per 1 gallon of water | | Number of Items | 1 | | Part Number | BCALMAG1Q | | Specific Uses For Product | Organic | | Target Species | plants | | UPC | 841401125141 | | Unit Count | 32 Fluid Ounces | ## Product Details - **Brand:** Bloom City - **Item Form:** Liquid - **Item Weight:** 2 pounds - **Liquid Volume:** 32 fluid ounces - **Specific Uses For Product:** Organic ## Images ![CAL-MAG - 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 ### ⭐⭐⭐⭐⭐ Great product! *by D***T on August 4, 2026* Did wonders for my plants! Will definitely purchase again. ### ⭐⭐⭐⭐⭐ 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 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, 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.at/products/48918090-cal-mag](https://www.desertcart.at/products/48918090-cal-mag) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-09-25*