Calcium Magnesium Plus

(11 customer reviews)


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

Not Avail in California


Product form:

Dry granules and flakes

Water soluble

NPK analysis:


Primary function/use:

A good source of the key essential nutrients for plant life – calcium and magnesium.

Product designation:


Product highlights:

High in beneficial calcium, magnesium, iron and trace minerals. This product meets or exceeds all other Cal Mag products on the market. No need to pay for water.

Well suited for:

Hydroponics, soil and soil-less.

How to mix:

Mix 1/2 tsp. with one (1) gallon of reservoir water.


Be sure to shake well when making a liquid solution.

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.

Additional information

Weight N/A

11 reviews for Calcium Magnesium Plus

  1. Carol

    Love this stuff, also a must for indoor grower, no more deficiencies in my grows! Thank You Kelp4less!!!!!!!!!!!!!!!

  2. K.T.

    Dissolves without any issues. Plants started new growth in 48 hrs despite deficiencies. Great product.

  3. Gina

    Use this product with my grow and bloom packs . Mixes easy and easy to use, great supplement for tomatoes to avoid tomato end rot.

  4. John Humble

    Awesome product, I use it along with the grow pack and bloom pack with amazing results.

  5. Mark Bohrer

    Excellent soluble product . I use this product during all phases of growing and bloom . Excellent for using in your own tea. Comes packaged nice and secure and with great instructions .

  6. Jay Tee

    The Organic Mechanic has helped me very much with his products and videos. Cal mag+ is an essential supplement for ALL hydroponic gardeners. As he says EVERYONE has water and with Cal mag+ you can make an almost unlimited supply of what is needed to get any hydroponic grow off to a healthy start. Watch his humic acid videos as well as the other supplements and you will see a great improvement in your hydroponic gardens.

  7. Chris

    Not only is this product good to give to my plants, it is necessary to treat the coco I grow in so it is absolutely essential for me. And the fact that it is a powder means I can ship enough to last me a while for a reasonable price.

  8. Jim Sutherland (verified owner)

    I started using reverse osmosis water and noticed that my plants were looking terrible…
    After adding the
    calcium magnesium plus my
    Plants have never looked better…
    Thanks tons

  9. cphillips1 (verified owner)

    I applied Cal Mag and Bloom Pack to my gerber daisies and zinnias. WOW! I never had so many blooms before using these two products. It’s so nice to see my flowers so happy.

  10. Ben Salvio (verified owner)

    Really helped with blossom end roy problems I have had in the past. Great product

  11. workin4penniesalldaylong (verified owner)

    “Calcium Magnesium Plus”
    is a must when your medium/soil is coco-fiber mix for you grows. The breakdown of this add will make the difference of lush beautiful garden to the comp pile. Is sent to you in a granule for you to make into your own mixture quantities.

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