Emerald Harvest Cal-Mag | 32oz

Calcium and Magnesium with Kelp Extract for Coco Coir and Hydroponic Systems (32oz)

Emerald Harvest Cal-Mag is a calcium-magnesium supplement with kelp extract — a natural source of nitrogen and other helpful compounds. Cal-Mag provides chelation to support nutrient absorption and helps minimize the risk of calcium or magnesium deficiencies when using coco coir and other growing media.

The 32oz size is convenient for home growers and small-scale cultivators who want a compact supply of Cal-Mag for use throughout a growing cycle or while evaluating Emerald Harvest Cal-Mag as part of their feeding program.

Key Features & Benefits

• Calcium and Magnesium Supplement — Provides calcium and magnesium to minimize deficiency risk in coco coir and other media.
• Contains Kelp Extract — Kelp extract is a natural source of nitrogen and other helpful compounds that complement the Cal-Mag formula.
• Provides Chelation — Chelation supports improved nutrient absorption by plant roots throughout the growing cycle.
• For Coco Coir and Other Media — Particularly suited for use with coco coir and other growing media that can create calcium or magnesium deficiency risk.
• For All Feeding Programs — Can be used as part of any feeding program that requires calcium and magnesium supplementation.

Who Should Use Emerald Harvest Cal-Mag

Cal-Mag suits hydroponic growers, coco coir cultivators, and indoor plant producers who want calcium and magnesium supplementation as part of their feeding program. It is particularly valuable for growers using coco coir and other growing media that are known to create calcium or magnesium deficiency risk, and for those who want the added benefit of kelp extract and chelation in their Cal-Mag supplement.

Calcium and Magnesium in Plant Nutrition

Calcium and magnesium are secondary macronutrients that play essential roles in plant health. Calcium is required for cell wall formation, membrane function, and proper root tip development. Magnesium is the central atom in the chlorophyll molecule and is involved in enzyme activation and photosynthesis. Coco coir and other growing media — as well as soft or reverse osmosis water — can contribute to calcium and magnesium deficiencies. Cal-Mag supplements are commonly used alongside base nutrient systems to ensure plants receive adequate levels of these secondary macronutrients throughout the growing cycle. Emerald Harvest Cal-Mag adds kelp extract — a source of nitrogen and other beneficial compounds — alongside the calcium and magnesium, and provides chelation for improved nutrient absorption.

Frequently Asked Questions

Why do growers using coco coir need Cal-Mag?

Coco coir has a natural cation exchange capacity that can bind and hold calcium and magnesium, making them less available to plant roots. Cal-Mag supplementation helps minimize the risk of calcium and magnesium deficiencies commonly associated with coco coir growing media.

What is the kelp extract in Emerald Harvest Cal-Mag for?

Kelp extract provides a natural source of nitrogen and other naturally occurring compounds found in kelp. It complements the calcium and magnesium in the Cal-Mag formula with the additional nutritional support kelp extract provides.

What does chelation mean in the context of Cal-Mag?

Chelation binds nutrients to organic molecules that protect them from precipitation and improve their uptake by plant roots. In liquid nutrient systems, chelated forms of calcium and magnesium are more readily available to plants than non-chelated mineral sources.

When should Cal-Mag be added to a feeding program?

Cal-Mag can be used throughout the growing cycle as part of any base nutrient feeding program. It is particularly important when using coco coir or soft/RO water that may contribute to calcium or magnesium deficiency risk. Follow current label directions for rates and timing by system type.

Can Emerald Harvest Cal-Mag be used with any base nutrient system?

Yes. Cal-Mag is designed to be used as a supplement alongside any base nutrient program. It provides calcium and magnesium supplementation regardless of the specific base nutrients being used. Follow current label directions for recommended rates.