Harvest Cal-Mag
Best nutrient supplement for growers seeking to maximize flowering and yields.
Emerald Harvest Cal-Mag is a liquid nutrient supplement designed to provide essential calcium and magnesium for robust plant growth. With an NPK ratio of 2-0-0, it effectively corrects deficiencies and promotes vibrant greenery, especially during flowering stages. This formula integrates seamlessly with base nutrient programs, making it ideal for coco coir media and any garden setup. Use Cal-Mag to nourish your crops, ensuring abundant flowering and maximizing yields for professional-grade results.
$12.84
Owner Satisfaction
4.6
/ 5
Category Rank
1939
/ 4425
#1939 in Fertilizers
Price vs Category Average
-79%
Below average
NPK Ratio
200
/ --
Who it's for
- Gardeners needing rapid recovery from nutrient deficiencies
- Growers seeking extra vegetative growth and plant vigor
- Emerald Harvest users wanting a streamlined feeding routine
Who should skip it
- Gardeners with naturally hard tap water sources
- Cultivators using high-nitrogen base fertilizers
- Budget-conscious growers managing large-scale operations
Performance breakdown
Nutrient Bioavailability
Mineral-based formula ensures rapid uptake for immediate plant deficiency correction.
Coco Coir Compatibility
Specifically engineered to mitigate common calcium-binding issues in coco substrates.
Flowering Support
Provides the essential secondary nutrients required for dense, high-quality floral development.
System Integration
Blends seamlessly into existing feeding schedules without disrupting base nutrient stability.
Foliar Vitality
Consistent application promotes deep green pigmentation and robust leaf structure.
Scaling Versatility
Available in sizes ranging from hobbyist quarts to professional 55-gallon drums.
Key Specs
NPK Ratio
2-0-0
Nitrogen
2.0%
Phosphorus
0.0%
Potassium
0.0%
Secondary Nutrients
Calcium and Magnesium
Fertilizer Form
Liquid Concentrate
Fertilizer Source
Mineral Based
Release Type
Quick Release
Features
- Supplies vital calcium and magnesium
- Enhances flowering and yield potential
- Optimized for coco coir growing
- Complements base nutrient programs
- Promotes healthy, green foliage
- Formulated with quality ingredients
What customers say
Growers rely on Emerald Harvest Cal Mag for its consistent quality and simple application. This concentrated formula effectively prevents and corrects common calcium and magnesium deficiencies, especially when growing in inert media like coco. Users value how easily it integrates into existing feeding schedules, providing robust results without complex changes. It stands out as a high value, foundational nutrient crucial for promoting strong plant vigor and maximizing growth potential.
Know before you buy
Coco coir has a natural tendency to bind with calcium and magnesium, which can lead to deficiencies in your plants. Emerald Harvest Cal-Mag is formulated to counteract this interaction, ensuring your plants receive the necessary nutrients to thrive in coco-based media.
Yes, this supplement is designed to integrate seamlessly with most base nutrient programs. It acts as a targeted boost to address specific calcium and magnesium needs without disrupting your primary feeding schedule.
The 2% nitrogen content provides a mild boost to support healthy, green foliage, but the primary purpose of this product is to supply secondary nutrients. It is intended to be used as a supplement rather than a standalone fertilizer.
While it is effective throughout the life of the plant, it is particularly beneficial during the flowering stage. Increased calcium and magnesium levels during this time help support structural integrity and maximize overall yield potential.
The mineral-based, quick-release formula ensures that the calcium and magnesium are readily available for immediate uptake by the roots. This allows for rapid correction of nutrient deficiencies and helps maintain consistent plant health.
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$13