Calcium Nitrate

Rated 5.00 out of 5 based on 3 customer ratings
(3 customer reviews)


Why Use It?

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

Product Documents

Not Available in California

Product Description

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.

Directions For Use

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.

All items are shipped using USPS Priority Mail, unless otherwise requested and arranged by the customer, prior to order completion.Free Shipping

All orders ship within 48 hours of order confirmation and as always FREE SHIPPING in the USA. After successfully placing an order from you will receive an order confirmation email with the details of your order to the email address provided.

Once your order has shipped you will be emailed specific tracking information.

To check the status of an order please visit our “View Order” page.

Gift Cards are electronically delivered to your email address.

State of Idaho is not an option for shipping any of our products. If you are in the State of Idaho, please contact us direct.

Kelp4less Disclaimer

While Kelp4less has made every effort to ensure accuracy of information on its website and labels, Kelp4less assumes no responsibility or liability for the use and results of any of it’s products.

The purchaser and the end user of Kelp4less products assumes sole responsibility and liability for product use, results and disposal. Kelp4less makes no guarantees either express or implied.

3 reviews for Calcium Nitrate

  1. Rated 5 out of 5

    Michael (verified owner)

    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. Rated 5 out of 5

    Don A in Pennsyltucky (verified owner)

    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. Rated 5 out of 5

    Scott (verified owner)

    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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