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.
$40.00
at
Moonlight Garden Supply
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
Form
Dry soluble
Package Weight
5 LB
Primary Nutrients
Calcium and Magnesium
Compatibility
Reverse osmosis water and coco coir
Fertilizer Source
Mineral Based
Season of Application
Spring, Summer, Fall, Winter
Container Weight
5.0 pounds
Water Soluble
True
Target Plant Type
Lawn, Vegetables, Flowers, Trees and Shrubs, Houseplants
Fertilizer Form
Water Soluble Powder
Know before you buy
Still have a question?
Ask Metto anything about the House & Garden CalMag before you decide.
