





🌿 Elevate your plant game with every drop — don’t let your garden miss out!
Bloom City’s Professional Grade Ultra Pure Cal-Mag Fertilizer delivers essential calcium and magnesium in an easy-to-use liquid form. Designed for all plant types and growing methods, it supports strong stems, vibrant leaves, and helps prevent nutrient deficiencies. Trusted by thousands with a 4.7-star rating, this 8 oz formula mixes effortlessly at 2-5 mL per gallon, making it a must-have for any serious gardener.



















| ASIN | B08JHFG5GH |
| Application Method | Watering |
| Brand | Bloom City |
| Coverage | Full |
| Customer Reviews | 4.6 out of 5 stars 6,599 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 Ounces |
| Item form | Liquid |
| Item weight | 8 Ounces |
| Liquid Volume | 8 Fluid 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 |
| Specific uses for product | Organic |
| Target Species | plants |
| UPC | 841401125691 |
| Unit Count | 8 Grams |
J**W
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!
D**T
Great product!
Did wonders for my plants! Will definitely purchase again.
R**.
Great vegetables food
Works great on all my vegetables
C**N
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.
T**I
Tomatoes love this!!!
Tomatoes love this fertilizer definitely a good buy!
Trustpilot
2 weeks ago
1 month ago