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๐ฟ Elevate your garden game with pure, professional-grade Cal-Mag magic!
Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer (8 oz) delivers a potent blend of calcium and magnesium designed to enhance plant strength, prevent common deficiencies like blossom end rot, and improve nutrient uptake. Ideal for both soil and hydroponic systems, this ultra-pure liquid formula supports steady, vigorous growth for vegetables, houseplants, and garden crops. Trusted by thousands with a 4.7-star rating, it offers a clean, clog-free solution made in the USA to keep your plants thriving season after season.



| Application Method | watered-in and foliar spray |
| Asin | B08JHFG5GH |
| Best Sellers Rank | #5,202 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #128 in Garden Fertilizers |
| Brand | Bloom City |
| Coverage | Full |
| Customer Reviews | 4.6 4.6 out of 5 stars (6,998) 4.6 out of 5 stars |
| 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 ounces |
| Liquid Volume | 8 fluid ounces |
| Manufacturer | Bloom City |
| Mixing Ratio | 2-5 mL per gallon |
| Number Of Items | 1 |
| Number Of Packs | 36 |
| Part Number | BCALMAG8OZ |
| Specific Uses For Product | Organic |
| Target Species | plants |
| Unit Count | 8 Ounce |
| Upc | 841401125691 |
User
Best plant fertilizer
Iโve been using the Bloom City Professional Grade Ultra Pure Cal-Mag (32 oz) for my plants, and Iโm very impressed with the results. Itโs made a noticeable difference in overall plant healthโespecially 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. Iโve 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 doesnโt cause buildup or clogging in my system, which Iโve had issues with in the past when using other brands. If youโre 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!
User
Great product!
Did wonders for my plants! Will definitely purchase again.
User
Plants looooove it
Plants love the cal mag!
User
didn't burn plants
I grew about 10 tomatoes outdoors in 10 or 15 gallon fabric pots this year. I used a calcium rich fertilizer when I started the plants because I knew that nutrients wash away in pots and aren't replenished and calcium loss can cause blossom end rot. I have had it before. The foliage looked good but when they set fruit, almost all except cherry tomatoes showed end rot, some fairly serious. I assume the fertilizer wasn't concentrated enough or washed away to quickly, I bought the cal mag supplement, mixed it 15-20ml to a gallon water and sprayed it on the entire plants in the evening. I live in a hot dry location and was worried about burning the plants so tested it on one plant first. When it didn't burn that one I did the rest. I continued treat the plants, sparying in the evening, about once a week. The end rot did go away, I can't actually confirm the product did it. We had gone through a very hot spell well into the 90s most days and with 20% humidity when I first noticed the problem. The weather let up a bit at the same time I stopped seeing the end rot. I might have changed the watering a bit too. It's possible it would have gone away on it's own. But I continue to spay once a week, it hasn't come back, and we have had some hot days since. So it didn't hurt the plants and maybe it helped.
User
Great vegetables food
Works great on all my vegetables
User
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.
User
Really Works!
This stuff really works! I had Blossom End Rot in one of my tomato pots, so I decided to give this a try. Within a week, all of the affected tomato's were improving and within two weeks the Blossom End Rot was gone!
User
Tomatoes love this!!!
Tomatoes love this fertilizer definitely a good buy!
Trustpilot
3 weeks ago
1 month ago