from £19.95
from £19.95

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Emerald Harvest - Cal-Mag

Emerald Harvest - Cal-Mag

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  • 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
  • Available in a range of sizes
  • Straight from Cali

Free Next Day Delivery



Keep your plants productive and green with Cal-Mag, Emerald harvest’s Calcium – Magnesium supplement. Cal-Mag helps regulate plant growth and productivity and ensures essential chlorophyll levels when growing in coco, soil as well as other media.

Cal-Mag is 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.

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, so your garden gets enough energy from light. Magnesium also activates enzymes your valuable plants need to uptake nutrients.

Cal mag is essential if you’re using R/O water or are in a soft water part of the country.


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