--- product_id: 48918090 title: "Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (32 oz)" brand: "bloom city" price: "$63.67" currency: USD in_stock: true reviews_count: 8 category: "Bloom City" url: https://www.desertcart.us/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-fertilizer-32 store_origin: US region: United States of America --- # Calcium & magnesium boost for vibrant growth Concentrated liquid formula, easy to mix Versatile for soil, hydroponics & all plant types Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (32 oz) **Brand:** bloom city **Price:** $63.67 **Availability:** ✅ In Stock ## Summary > 🌱 Elevate your garden game with every drop! ## Quick Answers - **What is this?** Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (32 oz) by bloom city - **How much does it cost?** $63.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-fertilizer-32) ## 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 - • **Fast-Acting Plant Revival:** Noticeably greener, healthier plants in days—no more yellowing leaves. - • **Universal Grower’s Ally:** Perfect for indoor, outdoor, and hydroponic gardens alike. - • **Clog-Free & Clean Application:** Dissolves fully without residue, protecting your irrigation system. - • **Power-Packed Nutrient Formula:** Calcium and magnesium support strong stems and lush leaves. - • **Precision Mixing, Maximum Impact:** Add just 2-5ml per gallon for effortless nutrient delivery. ## Overview Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer is a 32 oz concentrated liquid formula designed to deliver essential calcium and magnesium nutrients. Ideal for all plant types and growing methods—including soil and hydroponics—it supports strong stems, vibrant leaves, and prevents common deficiencies. Easy to mix and apply, it ensures fast, visible results without clogging irrigation systems, making it a must-have for gardeners seeking reliable, professional-grade plant nutrition. ## 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: Essential for the health and vitality of your plants - I bought this concentrated Cal Mag fertilizer because my plants were starting to show signs of nutrient deficiency (yellowing leaves and drooping edges), and the results have been amazing in just a few days. What I liked most: Exceptional performance: Being a concentrated formula, it lasts a very long time. A very small amount diluted in irrigation water is more than enough. Visible and fast results: The plants regained a vibrant green color and firmer, healthier leaves in no time. Complete formula: The extra supply of calcium, magnesium, and essential micronutrients has strengthened both the roots and overall growth. Easy to apply: It dissolves perfectly in water without leaving any residue or clogging sprayers. Conclusion: If you want to prevent nutrient deficiencies in your plants or give them that extra boost during the growth and flowering phases, this Cal Mag is an excellent investment. 100% recommended for any gardening enthusiast. 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 | | Best Sellers Rank | #813 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #46 in Garden Fertilizers | | Brand | Bloom City | | Brand Name | Bloom City | | Coverage | Full | | Customer Reviews | 4.7 out of 5 stars 6,893 Reviews | | Item Form | Liquid | | 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:** 32 Ounces - **Liquid Volume:** 32 Fluid Ounces - **Specific Uses For Product:** Organic ## Images ![Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (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 ### ⭐⭐⭐⭐⭐ Essential for the health and vitality of your plants *by F***O on July 20, 2026* I bought this concentrated Cal Mag fertilizer because my plants were starting to show signs of nutrient deficiency (yellowing leaves and drooping edges), and the results have been amazing in just a few days. What I liked most: Exceptional performance: Being a concentrated formula, it lasts a very long time. A very small amount diluted in irrigation water is more than enough. Visible and fast results: The plants regained a vibrant green color and firmer, healthier leaves in no time. Complete formula: The extra supply of calcium, magnesium, and essential micronutrients has strengthened both the roots and overall growth. Easy to apply: It dissolves perfectly in water without leaving any residue or clogging sprayers. Conclusion: If you want to prevent nutrient deficiencies in your plants or give them that extra boost during the growth and flowering phases, this Cal Mag is an excellent investment. 100% recommended for any gardening enthusiast. ### ⭐⭐⭐⭐⭐ 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 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. ## 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.us/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-fertilizer-32](https://www.desertcart.us/products/48918090-bloom-city-professional-grade-ultra-pure-cal-mag-fertilizer-32) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-31*