Calcium Nitrate

(3 customer reviews)


Supports peak production and plant development by providing essential and available Calcium and Nitrogen to any nutrient regimen.

Not Avail in California


Product form:

Dry granules, water soluble

NPK analysis:

15.5-0-0, containting 19% calcium

Well suited for:

All varieties of plants and growing applications.

Other product highlights:

A great soluble form of both calcium and nitrogen.

Product designation:


Primary function/use:

Calcium fertilizer.

When and where to use:

Use product through the grow and bloom stages. Feed weekly. Apply as a root drench. For best results avoid foliar spray.


Ensure bag is properly sealed and stored in cool, dry, dark place.

How to mix:

Mix four (4) oz. with 50 gallons of water for a ready to feed solution.

Mix one (1) oz. with 10 gallons of water for a ready to feed solution.

Additional information

Weight N/A

3 reviews for Calcium Nitrate

  1. Michael

    Great product and great price. I used it to stop blossom end rot in hydroponic system, that developed after changing to new food. used 1/2 tsp. per gal. I got Immediate results.

    1/2 tsp. per gal = 100 ppm
    1 tsp. per gal= 200 ppm
    1 tbspn. per gal = 600 ppm

  2. Don A in Pennsyltucky

    Blossom end rot has been a continual problem since we moved to this location. Our old place had soil with a limestone parent material but this one is more shale and lacks calcium. A few years ago we learned about adding calcium and had acquired a small supply of Calcium Nitrate from another supplier. It helped significantly but when it ran out, I had trouble finding a source until I happened upon Kelp4Less.

    The Kelp4Less formulation has a smaller granule size and it seems to absorb moisture more quickly so I have to keep the bag tightly closed. I mixed it with the starter fertilizer and mixed that with the soil before I planted my peppers and tomatoes this year. We have had some exceptionally wet weather lately but when I checked on the tomatoes today there was not a (knock on wood) hint of blossom end rot on anything. I’m glad that I don’t have to worry about organic certification because I’m sure this would be considered a chemical fertilizer but I won’t try to grow tomatoes or peppers without it.

  3. Scott

    I run an aquaponics system, and find calcium levels to be a major issue. Using calcium carbonate and bicarbonate won’t get enough calcium into my issue, so I use Calcium Nitrate. The product provides the much needed calcium, and a little extra boost of Nitrate. Every day I toss a Tablespoon full in.

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