Cal-Mag Plus 1 qt

Cal-Mag™ Plus is a specialized calcium, magnesium & iron, plant supplement designed to compensate for deficiencies in some commercial and hydroponic nutrient programs. Cal-Mag Plus also compensates for the natural calcium draw of coco coir fiber.


Maintain Balance


Cal-Mag™ Plus provides a precise balance and optimal ratios of the calcium, magnesium, and iron that are critical throughout all stages of growth, especially in heavily fruiting plants and fast blooming annuals. Cal-Mag Plus is fortified with a proprietary blend of select trace minerals to help maximize yields in fruiting and flowering plant varieties, prevent blossom end rot in tomatoes and peppers, and reduce tip burn in lettuce. When used in combination with nutrient solutions Cal-Mag Plus functions as a catalyst to increase the uptake of essential minerals.

Cal-Mag Plus contains: calcium, magnesium, iron, boron, zinc, manganese, molybdenum, copper, cobalt, iodine, beneficial vitamins, twenty essential amino acids and select botanical plant extracts.



  • Inhibits blossom end rot by providing additonal calcium and increasing nutrient uptake.
  • Strengthens plant cells and tissues for increased resistance to stress.
  • Prevents interveinal chlorosis, stunted growth rates, and upward leaf curl.
  • Increases cell division and plant tissue development.
  • Increases flower and fruit sets.
  • Increases water, nutrient, and carbon dioxide uptake.
  • Increases growth rates and crop maturity.
  • For hydroponics, soil and container gardens
  • Tomatoes, Peppers, Lettuce, fruit and flower bearing plants
  • Use with Botanicare® Nutrients or preferred nutrient program
  • Always use to supplement reverse osmosis water


Guaranteed Analysis:

  • Total Nitrogen (N): 2.0%, 2.0% Nitrate Nitrogen
  • Calcium (Ca): 3.2%
  • SMagnesium (Mg): 1.2%, 1.2% Water Soluble Magnesium (Mg)
  • Iron (Fe): 0.1%, 0.1% Chelated Iron (Fe)

Derived from: Calcium Nitrate, Magnesium Nitrate, Iron EDTA


Q: Will the iron in Cal-Mag Plus be affected by my magnetic pump?
A: The chelated form of iron present in Cal-Mag (iron EDTA) is non-magnetic, and will not be removed from the nutrient solution by the pump. You won’t need to purchase a grounding probe, and if you follow the recommended application rates, you should not notice any iron deficiencies in the plants.

Q: Why is it recommended to use Cal-Mag Plus with R.O. Water?
A: Reverse Osmosis (R.O.) water filtration forces water through a series of fine mesh screens removing all contaminants that are too large to pass through the screens. Large Calcium and Magnesium molecules commonly found in tap water are included in this filtration and are also removed from the filtered water. Cal-Mag Plus is therefore recommended for any grower who utilizes R.O. water to return these essential elements back into the water.

Q: Why is it recommended to use Cal-Mag Plus when growing in Coco Coir based media?
A: Coco’s high cation exchange draws calcium away from plants. Therefore using Cal-Mag Plus with these mediums will offset this effect which prevents deficiencies from occurring.

Q: Can I foliar spray with Cal-Mag Plus?
A: Yes you can foliar spray with Cal-Mag Plus and it is a great way to quickly correct deficiencies during the vegetative and transition phases. We do not recommend applying any product via foliar spray late into the flower cycle when growing tight flowers, as excess moisture can lead to mold and mildew. Apply at the rate of 5 ml (1 tsp) per gallon a maximum of twice a week.

Q: Will the iron EDTA in Cal-Mag Plus harm beneficial microbes?
A: There are no components in Cal-Mag Plus that are inherently toxic to any beneficial microbes or fungi. EDTA is technically toxic to fungi, but has only been shown to act as a fungicide at extremely high concentrations exceeding 10,000 parts-per-million. Using enough Cal-Mag Plus to provide this level of EDTA would easily kill the plants before the fungi or beneficial would be effected. At the listed application rates, Cal-Mag Plus provides a level of iron EDTA far below the level of toxicity, and is perfectly safe to use with beneficial microbes and fungi.

Q: What does the ‘Plus’ in Cal-Mag Plus mean?
A: The ‘Plus’ refers to the iron, organic acids, vitamins, and over 72 trace minerals also contained in the formula. These elements not only help overall growth but also help to enhance uptake of macro nutrients such as calcium and magnesium.

Q: What application rate should I use during flowering? More or less than the vegetative phase?
A: You should use 5 ml/gallon of Cal-Mag Plus during the vegetative and early bloom stages. During the halfway point of the flowering stage, you might want to reduce the application to 3 ml/gallon, to avoid adding excess nitrogen to the nutrient solution based upon your plant specific needs.


Support your local community. This product is proudly made in the USA!

  • Item #: BCCMQT
  • Manufacturer: Botanicare

Cal-Mag Plus 1 qt

Price: $18.95
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