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Item #:
6535427
Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon) | Helps Reduce Blossom End Rot, Corrects Deficiencies, Boost Calcium Uptake,
Item #:
6535427
BND 78
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Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer contains more micronutrients than any other brand and is formulated for optimal nutrient uptake
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What Stands Out
Ultra Pure Formula
Bloom City’s ultra pure Cal-Mag formula ensures optimal nutrient absorption, promoting robust plant growth and healthier yields compared to competing fertilizers.
Professional Grade Quality
Designed for serious growers, this professional-grade fertilizer delivers exceptional performance for various plants, addressing deficiencies effectively and enhancing overall plant vitality.
Easy Application
Convenient 1/2 pint size allows for precise measurement and simple application, making it user-friendly for both novice gardeners and seasoned horticulturists seeking efficient nutrient management.
Product Details
| Brand Name | Bloom City |
| Model Number | Cal-Mag UltraPure | Plus Micros |
| Manufacturer | Bloom City |
| Number of Items | 1 |
| UPC | 841401125158 |
| Unit Count | 128 Ounce |
| Part Number | BCALMAG1G |
| Liquid Volume | 1 gallons |
| Item Form | Liquid |
| Coverage | Full |
| Target Species | Houseplants, Greenhouse Plants, Edible Plants (fruits and veggies), Trees, Turf |
| Mixing Ratio | 2-4 mL per gallon (vegetative stage), 3-5 mL per gallon (bloom) |
| Brand | Bloom City |
| Number of Packs | 1 |
| Package Weight | 8 Pound (3.63 kg) |
Who Should Buy?
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Indoor Gardeners
Ideal for indoor gardening, ensuring plants receive essential calcium and magnesium for healthier growth.
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Vegetable Cultivators
Perfect for vegetable growing, providing necessary nutrients to enhance yield and prevent deficiencies.
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Hydroponic Users
Especially beneficial for hydroponic setups, where nutrient balance is critical for plant health and productivity.
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Soil-Only Growers
Not suitable for growers who rely solely on soil amendments as it targets hydroponic and controlled environments.
Product Description
Bloom City Professional Grade Ultra Pure Cal-Mag Fertilizer, (1 Gallon) | Helps Reduce Blossom End Rot, Corrects Deficiencies, Boost Calcium Uptake, Made for Hydro & Soil, Supports Tomatoes & Peppers
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What are the benefits of using Bloom City Cal-Mag fertilizer?
Answer: Bloom City Cal-Mag fertilizer contains more micronutrients than any other brand and is formulated for optimal nutrient uptake. It also helps prevent common growth deficiencies and is compatible with any nutrient system. -
Question:
How do I apply Bloom City Cal-Mag fertilizer?
Answer: Apply Bloom City Cal-Mag fertilizer in every stage of growth for strong stalk and leaf health. It can be applied with every watering for full benefits. -
Question:
Where is Bloom City Cal-Mag fertilizer made?
Answer: Bloom City Cal-Mag fertilizer is formulated and made in the USA by botanists and plant chemists in Seattle, Washington. The brand chooses only the highest quality ingredient sources and manufacturing methods to create the world's best craft growing nutrient systems. -
Question:
Is there nitrogen in this?
Answer: Yes, there is nitrogen. The guaranteed analysis of nutrient content on our Cal-Mag is Total Nitrogen 2%, 2% Nitrate Nitrogen. -
Question:
Is it compatible with all growth mediums?
Answer: Yes, it is compatible with all growing mediums including soil, cocoa coir, peat, hydroponic systems, etc. -
Question:
Can it be mixed with epsom salt?
Answer: Yes, it can be added to epsom salt in a water solution. However, we suggest trying the Cal-Mag first on the plants as it may provide sufficient magnesium. -
Question:
What would be the salt in ppm per dose added to RO or distilled water?
Answer: 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. -
Question:
How much should be added per gallon of water in ounces?
Answer: An ounce of CalMag per gallon would be too much. It is recommended to add 1 teaspoon (5mL) per gallon. -
Question:
How early can you feed seedlings with it?
Answer: You can start feeding seedlings with it at 1/2 strength as soon as you put them in dirt, and go full strength at 4 weeks. -
Question:
What is the pH of this product?
Answer: In feed water, Bloom City Cal-Mag will drop the pH down about 0.5 pH per mL added. The pH in concentrate is fairly low. -
Question:
Is there a certain weather temperature where this product is not recommended to be given to vegetable plants?
Answer: No, but it is recommended to do the feeding in the morning before the high heat of the day. -
Question:
How much should I add per gallon at different stages for hydroponic tomatoes with Masterblend as base nutrients?
Answer: Always follow the instructions on the container. -
Question:
Can this be used to induce the flowering stage in coffee plants?
Answer: Yes, it can be used in addition to fertilizer to promote plant health and profuse bloom.
Bloom City Fertilizers & Plant Food Cal-Mag UltraPure | Plus Micros Editorial Review
** Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer** Bloom City Professional Grade Ultra Pure Cal-Mag Growing Fertilizer has garnered positive reviews among home gardeners, particularly for its effectiveness in boosting the health of various plants, especially tomatoes and peppers. Users have reported a marked improvement in their plants after just one or two applications, with many mentioning that issues such as blossom end rot and nutrient deficiencies were resolved promptly with this product. The fertilizer has been praised for its organic formulation, which is a significant draw for eco-Conscious Consumers. Many customers highlight the ease of use — simply measure, mix with water, and apply. Users appreciate the recent updates to the measuring guidelines, but some express confusion over the changes compared to previous versions. Overall, customers feel that the product is trustworthy, effective across all growth stages, and offers great value for money. The Consistent positive feedback regarding the strength and productivity of crops, particularly tomatoes, indicates that this fertilizer is a worthy addition to any gardener's arsenal. **
Customer Reviews & Ratings
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Pros
- Quick improvement in plant health after application
- Effective for multiple plant types, particularly tomatoes and peppers
- Organic formulation
- Simple to use with clear measurement guidelines
- Good value for money
Cons
- Some confusion regarding changes in measurement guidelines between product updates
Platform Trust & Buyer Confidence
MA
Mohammad
Verified buyer
“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”
23 July 2026 · via Trustpilot
CK
Chitra
Verified buyer
“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”
22-Jul-26 · via Trustpilot
K
kund
Verified buyer
“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”
23-Jul-26 · via Trustpilot
OO
Onesi
Verified buyer
“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”
22 July 2026 · via Trustpilot
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SAO JOHN
Verified buyer
“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”
23 July 2026 · via Trustpilot
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BND 78
Order now and get it around Wednesday, August 05
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Features & Benefits
- Contains more micronutrients than any other brand
- Bioactivated formula for optimal nutrient uptake
- Prevents common growth deficiencies
- Compatible with any nutrient system
- Formulated and made in the USA
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