House & Garden CalMag
Best nutrient supplement for coco coir growers using reverse osmosis water.
This is the backbone of a high-performance dry nutrient regimen, providing the essential calcium and magnesium your plants crave. While it demands a bit more manual mixing than liquid alternatives, the precision and stability it brings to coco coir and RO water systems are unmatched for serious growers.
$24.86
at
Horticulture Source
Who it's for
- Gardeners needing an urgent fix for yellowing leaves
- Growers switching between soil and hydroponic systems
- Cultivators aiming for heavy yields and sturdy stems
Who should skip it
- Shoppers who rely on local big-box garden centers
- Budget-conscious hobbyists seeking affordable nutrient solutions
- Beginners who prefer a simple, forgiving feeding schedule
Performance breakdown
Nutrient Solubility
Dissolves rapidly in water without leaving behind stubborn sediment or residue.
Coco Coir Compatibility
Specifically engineered to bridge the nutrient gap in coco-based growing media.
RO Water Optimization
Perfectly balances mineral deficiencies common in reverse osmosis water systems.
System Integration
Seamlessly anchors the three-part dry soluble program for consistent feeding cycles.
Growth Efficacy
Delivers a potent nitrogen boost that visibly accelerates vegetative plant development.
Ease of Storage
Dry powder format ensures long-term stability compared to liquid nutrient alternatives.
Key Specs
Total Nitrogen (N)
12.0%
Calcium (Ca)
10.0%
Magnesium (Mg)
3%
Phosphorus (P)
0.0%
Potassium (K)
0.0%
Package Weight
5.0 lbs
Form
Water Soluble Powder
Application Method
Drench
Water Soluble
Yes
Season of Use
All Season
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