Greenway Biotech Cal-Mag Plus
Top Pick
Greenway Biotech

Greenway Biotech Cal-Mag Plus

4.7

Best nutrient supplement for hydroponic growers preventing mineral deficiencies.

This concentrated powder is the most efficient way to fortify your plants against common mineral deficiencies, especially when using coco coir or purified water. By opting for a dry formula over liquid alternatives, you eliminate the extra water weight and waste, ensuring your system stays clean while your plants build stronger, more resilient cell walls.

$33.99

Out of stock
Plant Type Application Vegetables, Indoor Plants, Lawn
Vegetables, Indoor Plants
Vegetables, Indoor Plants, Lawn

Who it's for

  • Gardeners struggling with blossom end rot or nutrient deficiencies
  • Hydroponic growers needing clog-free, easily soluble nutrient solutions
  • Indoor growers seeking gentle vegetative growth without nutrient burn

Who should skip it

  • Beginners looking for a simple, all-in-one fertilizer solution
  • Casual growers who prefer low-maintenance, hands-off feeding schedules
  • Budget-conscious gardeners prioritizing cost-effective, general-purpose feeding

Performance breakdown

Nutrient Bioavailability

Chelated iron and nitrate forms ensure rapid, efficient plant uptake.

Excellent

System Compatibility

Complete solubility prevents clogging in delicate hydroponic irrigation lines.

Excellent

Concentration Efficiency

Dry powder format eliminates shipping water weight and reduces plastic waste.

Excellent

Deficiency Correction

Targeted mineral profile quickly resolves common coco coir lockout issues.

Excellent

Purity Standards

Third-party heavy metal testing provides essential peace of mind for growers.

Excellent

Ease of Mixing

Requires careful initial dilution but offers superior long-term storage stability.

Excellent

Key Specs

N-P-K Ratio

2-0-0

Guaranteed Analysis

3.2% Ca, 1.2% Mg, 0.1% Fe-EDTA

Form

Dry Powder Concentrate

Preparation Ratio

2.5 lbs makes 1 gallon of concentrate

Heavy Metal Content

Tested below detection limits

Shelf Life

Indefinite when kept dry

Registration

CDFA Registered

Derived From

Calcium Nitrate, Magnesium Nitrate, Iron EDTA

Fertilizer Source

Synthetic

Nitrogen Percentage

2%

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Greenway Biotech Cal-Mag Plus

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Greenway Biotech
Greenway Biotech
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$33.99
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