







🌱 Elevate your garden game with every drop—because your plants deserve the best!
Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer is an 8 oz liquid supplement delivering precise calcium and magnesium nutrition. Designed for easy mixing at 2-5ml per gallon, it supports strong stems and vibrant leaves across indoor, outdoor, and hydroponic plants. Trusted by gardeners for rapid nutrient correction and versatile use, this organic-grade formula integrates effortlessly into any plant care routine.



















| ASIN | B08JHFG5GH |
| Best Sellers Rank | #3,624 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #142 in Garden Fertilizers |
| Brand | Bloom City |
| Date First Available | January 4, 2023 |
| Item Form | Liquid |
| Item Weight | 8 ounces |
| Liquid Volume | 0.5 Pints |
| Manufacturer | Bloom City |
| Number of Items | 1 |
| Package Dimensions | 6.26 x 1.93 x 1.85 inches |
| Specific Uses For Product | Organic |
| UPC | 841401125691 |
| Unit Count | 8 Ounce |
M**Y
Calcium magnesium fertilizer
I grow bell peppers and other types of peppers in my garden. Sometimes they need calcium and magnesium to fertilize them or they start getting the source fights on them. I decided to try this one to see if it would work. I use this and within a week, my plants perked up really well. The pepper started looking very nice and green and healthy. I’m very satisfied with this product. I would suggest this for anybody this fertilizer is good quality it’s effective and being organic makes it even better.
G**E
Great for correcting nutrient deficiencies
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.
W**R
Works as advertised
I initially got this for my raised garden tomatoes. When I noticed my bell pepper plants in growbags were experiencing end rot, I used this on them. Probably 2 doses in a month. From that point forward, it cured the end rot in the new bells. Seemed to act quick and I haven't had the need to add anymore this season. This was great to have on hand. Would order again.
T**N
Works great
Works great
L**A
Nice tomatoes
Keeps those tomatoes from splitting or having root rot
B**S
Great product ill use it from now on well worth the moneyh
Great product I had the best tomatoes this years than ever before.got rid of all blossom rot
K**R
Perfect Addition to Liquid Fertilizer
I grow my tomatoes in pots and before using this I had blossom end rot even though I fertilized regularly with water solutions I still had this problem. Since I started using this with my fertilizer the problem went away. I use it all liquid fertilizers on a 10 day fertilizing schedule and I get a bumper crop of everything. A quart, for me lasts a season.
J**R
Your plants probably need this
Tomato garden report: I usually use Fox Farm Big Bloom and Tiger Bloom for my tomato garden with good results. This year, I added Cal Mag to the fertilizer blend and have had my best crop ever! Mid to late season, I always feel like the garden needs a little more nitrogen. This adds just enough. The cal mag part really does a lot to strengthen the fruit skin. Besides resisting pests in the garden, it makes it easy to slice or remove the skins when cooking the harvest. The red tomatoes are Granny Cantrell. This plant has produced over 50 lbs--so far. The yellow one is called Kellogg's Breakfast. It wasn't quite as productive, but the giant yellow globes have really impressed the neighbors.
Trustpilot
2 months ago
2 weeks ago