Emerald Harvest Cal-Mag 2-0-0 with Kelp

Emerald Harvest Cal-Mag 2-0-0 is a kelp-enhanced calcium and magnesium supplement formulated to prevent or correct mineral deficiencies while supporting healthy roots, strong plant tissue, green foliage, and efficient photosynthesis. It is especially beneficial for plants grown in coco coir, hydroponic media, or other conditions where calcium and magnesium availability may be limited.

In addition to essential minerals, Emerald Harvest Cal-Mag contains natural kelp extract—a source of proteins, amino acids, biocatalysts, and naturally occurring plant compounds. This specialized formula supports nutrient uptake, root development, plant vigor, and productive flowering without replacing a complete base fertilizer.

Key Benefits

• Calcium and magnesium support: Helps prevent or correct two of the most common mineral deficiencies encountered by growers.
• Stronger plant tissue: Calcium supports cell formation, cell-wall strength, membrane stability, and healthy new growth.
• Greener foliage: Magnesium is central to chlorophyll production and supports efficient photosynthesis.
• Kelp-enhanced formula: Supplies naturally occurring proteins, amino acids, phytohormones, and biocatalysts.
• Improved nutrient availability: Amino acids found in kelp can function as natural chelators that support mineral uptake.
• Root-development support: Kelp-derived auxins help support active root tips and extensive root development.
• Coco coir compatibility: Helps compensate for calcium and magnesium interactions commonly encountered in coco.
• Broad growing-media versatility: Suitable for hydroponics, coco coir, soilless mixes, and other growing media.
• Full-cycle flexibility: May be used as needed from early vegetative growth through late flowering.

Guaranteed Analysis and Ingredients

• N-P-K: 2-0-0
• Total nitrogen: 2%
• Calcium: 3%
• Magnesium: 0.5%
• Derived from: Ammonium calcium nitrate double salt, magnesium sulfate, calcium acetate, magnesium acetate, and kelp extract
• Product type: Liquid calcium, magnesium, nitrogen, and kelp supplement

Emerald Harvest Cal-Mag is a supplemental formula and should be used alongside an appropriate base nutrient program.

How Calcium Supports Plants

Calcium performs several essential structural and metabolic functions:

• Supports the formation of new cells
• Helps strengthen cell walls and plant tissue
• Supports healthy root and shoot development
• Helps regulate the transport of other nutrients
• Activates certain enzymes and natural plant processes
• Assists with nitrogen utilization
• Supports healthy new growth in rapidly developing plants

Because calcium has limited mobility within plants, consistent availability is particularly important during active root, shoot, flower, and fruit development.

How Magnesium Supports Plants

Magnesium forms the central atom within the chlorophyll molecule, making it essential for green foliage and photosynthesis. It also supports:

• Light-energy conversion
• Plant respiration
• Enzyme activity
• Phosphorus utilization
• Iron utilization
• Carbohydrate production and movement
• Overall plant metabolism

Insufficient magnesium may appear as interveinal yellowing, often beginning on older leaves. Similar symptoms can also result from improper pH, excessive EC, root stress, or nutrient lockout.

Benefits of Kelp Extract

Emerald Harvest Cal-Mag includes natural kelp extract to provide more than mineral nutrition. Kelp supplies naturally occurring:

• Auxins: Support root-tip and plant growth.
• Cytokinins: Support cell division, branching, and plant development.
• Amino acids: Function as natural chelators that can improve nutrient availability.
• Proteins and biocatalysts: Support plant metabolism and overall vigor.
• Trace compounds: Complement the calcium and magnesium mineral formula.

These components make Emerald Harvest Cal-Mag a well-rounded supplement for plants experiencing increased mineral demand or challenging growing conditions.

How to Use

Mix 2–5 mL per gallon of water, as needed.

• Preventive Application: Begin near the lower end of the range when source water or growing media provide limited calcium and magnesium.
• Corrective Application: Gradually increase within the recommended range while monitoring plant response and total nutrient strength.
• Application Period: Use as needed from early vegetative growth through late flowering.
• Preferred Timing: Emerald Harvest recommends applying Cal-Mag on water-only days.
• Sturdy Stalk Programs: Do not use Cal-Mag and Emerald Harvest Sturdy Stalk during the same watering.

The appropriate dosage depends on source-water mineral content, base fertilizer, growing medium, plant demand, growth stage, and existing EC or PPM.

Recommended Mixing Instructions

1. Shake the container thoroughly before measuring.
2. Fill the watering container or reservoir with fresh water.
3. Add Emerald Harvest Cal-Mag at the appropriate rate.
4. Mix thoroughly before introducing any other compatible products.
5. Add additional nutrients or supplements individually when required by your feeding program.
6. Mix completely between each addition.
7. Check the final EC or PPM and pH before application.

Never combine Cal-Mag directly with undiluted nutrient concentrates. Do not add Emerald Harvest Sturdy Stalk to the same watering solution.

Coco Coir and Hydroponic Use

Coco coir can hold calcium and magnesium on its exchange sites, reducing the amount immediately available to plant roots. Supplemental Cal-Mag can help maintain adequate mineral availability and reduce the likelihood of deficiency symptoms.

Cal-Mag may also be useful with reverse osmosis water, distilled water, rainwater, or other low-mineral water sources. Begin conservatively and monitor the completed nutrient solution because the necessary amount depends on the base fertilizer and source-water profile.

Growing Media and System Compatibility

Emerald Harvest Cal-Mag is suitable for:

• Coco coir
• Hydroponic growing media
• Soilless mixes
• Recirculating hydroponic systems
• Drain-to-waste systems
• Deep water culture
• Drip irrigation and fertigation
• Flood-and-drain systems
• Rockwool
• Container gardens and soil applications

Adjust the application rate according to source-water quality, growing medium, system design, and plant response.

Using It With Other Emerald Harvest Products

Emerald Harvest Cal-Mag is formulated to complement the brand’s Grow, Micro, Bloom and Cali Pro base nutrient programs. Because these base fertilizers already supply calcium, magnesium, and other essential elements, use supplemental Cal-Mag only when the growing medium, source water, or plant response indicates an increased need.

When using multiple supplements, monitor the total EC or PPM to prevent overfeeding. Do not combine Cal-Mag and Sturdy Stalk in the same watering; alternate their applications according to the Emerald Harvest feeding chart.

Important Usage Notes

• Use Cal-Mag as a supplement, not as a complete base fertilizer.
• Apply between 2 and 5 mL per gallon as needed.
• Recommended for water-only days.
• Do not use Cal-Mag and Sturdy Stalk in the same watering.
• Avoid unnecessary supplementation when source water and base nutrients already supply adequate minerals.
• Confirm that deficiency symptoms are not being caused by improper pH, excessive EC, overwatering, or root-zone stress.
• Store tightly sealed under normal, temperature-controlled conditions.