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Emerald Harvest Cal-Mag Supplement




Keep your plants productive and green with Cal-Mag (2-0-0), a calcium-magnesium supplement from Emerald Harvest. Containing top-quality ingredients, Cal-Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield. This is especially important when growing in some media, such as coco coir, but any garden can benefit.

SKU: NUT-EH-CM-B Categories: , , Tag:
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HTG Supply is committed to providing you with the very best products, pricing and service in the industry. We will ship your order fast and discreetly packaged to protect your privacy. Buy with confidence knowing your HTG Supply purchase includes simple returns as well as lifetime product support. Call our team of real growing experts with your purchasing or product use questions, and we will be here to help!

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Customer Service:  1-866-710-GROW (4769) | [email protected] | Hours: Mon-Fri 9:00 a.m. to 5:00 p.m.


Emerald Harvest Cal-Mag Calcium and Magnesium Supplement

Cal-Mag helps regulate plant growth and productivity and ensures essential chlorophyll levels, especially when growing in coco coir and other inert media. Derived from calcium nitrate, magnesium, sulfate, calcium acetate, magnesium acetate, and kelp extract. Growers use calcium-magnesium supplements to strengthen their plants and correct nutritional deficiencies inherent to some popular growing media. Calcium regulates growth and encourages plant development, while magnesium is essential for chlorophyll production. Magnesium also activates enzymes your plants need to uptake nutrients. Use Cal-Mag as a supplement to your favorite base nutrient series for guaranteed professional results.


  • Prevent calcium or magnesium deficiency in your garden
  • Promotes chlorophyll production in your plants to keep them green and healthy
  • Activate the enzymes that help your plants uptake nutrients


View Cali Pro Feeding Schedule

View Grow Micro Bloom Feeding Schedule

Guaranteed Analysis:

  • Total Nitrogen:………………………..2.00%
    • Ammoniacal Nitrogen 0.10%
    • Nitrate Nitrogen 1.90%
  • Calcium:…………………………………3.00%
  • Magnesium:……………………………0.50%

Derived from calcium nitrate, magnesium, sulfate, calcium acetate, magnesium acetate and kelp extract.



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