Is there nitrogen in this? It would be helpful for the seller to post the bottle back side label.

Hey there, good idea on posting the labels, adding that to my to-do list! To answer your question, yes there is Nitrogen. Here is the guaranteed analysis of nutrient content on our Cal-Mag. Total Nitrogen 2%, 2% Nitrate Nitrogen, Calcium 2%, Magnesium 0.6%, Boron .002%, Copper .003%, iron .004%, Manganese .004%, Zinc .004%. Derived from: Calcium Nitrate, Magnesium Nitrate, Boric Acid, Copper Sulfate, Ferric Sulfate, Manganese Sulfate, Zinc Sulfate. Hope that helps! James - Bloom City Crew

Site says it is compatible with all growth mediums, but bottle says for hydroponic use ONLY. Which is it?

That terminology on the bottle is unfortunately a labeling requirement placed on us by regulators. It is compatible with all growing mediums, including soil, cocoa coir, peat, hydroponic systems, etc. Thanks, James - Bloom City Crew

Can this be mixed with epsom salt for additional magnesium as a foliar spray or added as a root drench?

Hi, Great question. It can be added to epsom salt in a water solution, however we suggest you try this Cal-Mag first on the plants - its probably more than enough magnesium. We use highly bio-available mineral forms and add organic acids to the product to increase uptake. Its also great as both a foliar spray and a root drench! Let us know how the plants grow!

What would be the salt in ppm per dose added to ro or distilled water?

Hi, thanks for the question! 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. Let us know if you have any other questions! James - Bloom City Crew

Professional Grade Ultra Pure Cal Mag Growing Fertilizer Quart 32

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Description

🌱 Elevate your plant game with the pure power of Cal-Mag!

BEGINNER FRIENDLY FORMULA - Simple to integrate into any routine, from novice growers to seasoned pros.
EFFORTLESS NUTRIENT BOOST - Just 2-5ml per gallon—no fuss, no mess, just thriving plants.
PREVENTS DEFICIENCY SYMPTOMS - Say goodbye to yellowing leaves and weak growth with consistent use.
UNIVERSAL PLANT COMPATIBILITY - Perfect for houseplants, outdoor gardens, and hydroponics alike.
STRONGER STEMS GREENER LEAVES - Calcium and magnesium power your plants’ structural and visual health.

Bloom City’s 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, it’s the go-to solution for consistent, healthy plant growth indoors and out.

Specifications

ASIN	B073ZNQWCM
Best Sellers Rank	#1,902 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #101 in Garden Fertilizers
Brand	Bloom City
Brand Name	Bloom City
Coverage	Full
Customer Reviews	4.6 out of 5 stars 6,813 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

Reviews

J**W

26.03.2026

G**E

12.06.2025

R**Y

27.03.2026

A**R

17.01.2026

J**N

27.03.2026

M**D

10.04.2026

M**Y

18.09.2025

A**R

2.03.2026

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