






Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.
Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.
๐ฑ Elevate your plant game with the pure power of Cal-Mag!
Bloom Cityโs Professional Grade Ultra Pure Cal-Mag is a liquid fertilizer delivering essential calcium and magnesium in an easy-to-mix formula. Suitable for all plant types and growing methods, it supports strong stems, vibrant leaves, and prevents nutrient deficiencies. Trusted by thousands with a 4.6-star rating, itโs the go-to solution for consistent, healthy plant growth indoors and out.



















| ASIN | B073ZNQWCM |
| Best Sellers Rank | #2,193 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #107 in Garden Fertilizers |
| Brand | Bloom City |
| Brand Name | Bloom City |
| Coverage | Full |
| Customer Reviews | 4.7 out of 5 stars 6,816 Reviews |
| Item Form | Liquid |
| Item Weight | 32 Ounces |
| 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 |
J**W
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!
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.
R**Y
Great product great customer service
Great stuff.Great price would buy it again over and over again.Very good customer service is excellent.Not like athena
A**R
Noticeable difference in a couple days.
This stuff works well. I noticed a significant increase in my plants health and size after about 2 days. It gave my plants a healthy green vibrant look. My only complaint is with whoever shipped it. It had a seal but was missing the lid. Luckily, the lid from my bai drink bottle ended up fitting perfectly.
J**N
Chefs choice
This stuff is strong, reliable and never runs out. It's a rather large bottle.
M**D
Recommend
Great product I highly recommend it
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. Iโm very satisfied with this product. I would suggest this for anybody this fertilizer is good quality itโs effective and being organic makes it even better.
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
1 month ago
3 weeks ago