Roots Organics CalMag
Best secondary nutrient supplement for growers needing precise control over fertility.
Roots Organics Cal Mag is a pure, all-natural liquid supplement designed to support plants experiencing rapid growth phases. This formula is intentionally derived without added nitrogen, phosphate, or potassium, giving growers precise control over primary fertility ratios. It is especially beneficial for fast-growing and heavy-feeding varieties. For optimal results, use this calcium, magnesium, and sulfur blend alongside primary fertilizers such as Roots Organics Buddha Grow and Buddha Bloom. Available in quart and gallon sizes, this product ensures essential secondary nutrients are available when your plants need them most for robust development.
$28.90
Owner Satisfaction
4.6
/ 5
Category Rank
1939
/ 4425
#1939 in Fertilizers
Price vs Category Average
-53%
Below average
NPK Ratio
000
/ --
Who it's for
- Versatile growers managing multiple mediums like soil and hydroponics
- Gardeners needing fast relief for nutrient-deficient plants
- Organic growers prioritizing natural soil health and sustainability
Who should skip it
- Budget-conscious growers seeking highly concentrated, cost-effective formulas
- Precision feeders managing nitrogen levels during late flowering stages
- Hydroponic users wanting to avoid sediment in irrigation lines
Performance breakdown
Nutrient Precision
Zero-NPK formula allows for total control over primary fertility ratios.
Growth Support
Essential secondary nutrients fuel rapid development in heavy-feeding plant varieties.
System Compatibility
Integrates seamlessly into existing feeding schedules with standard base fertilizers.
Ingredient Purity
All-natural composition ensures clean supplementation for sensitive root systems.
Application Versatility
Effective across a wide range of garden types from vegetables to houseplants.
Solubility Efficiency
Requires careful mixing due to the non-water-soluble nature of the concentrate.
Key Specs
NPK Ratio
0-0-0
Form
Liquid Concentrate
Primary Components
Calcium, Magnesium, Sulfur
Intended Use
Supplementation during fast growth
Compatibility
Designed to work with base fertilizers like Roots Organics Buddha Grow and Buddha Bloom
Fertilizer Source
Natural
Nitrogen Percentage
0.0%
Phosphorus Percentage
0.0%
Features
- Pure and all-natural nutrient blend
- Precise fertility control without added NPK
- Supports fast-growing plants
- Ideal for heavy feeders
- Provides essential calcium, magnesium, sulfur
- Customizable nutrient ratios
- Works with base fertilizers
What customers say
Roots Organics CalMag earns high praise for its immediate effectiveness in correcting nutrient deficiencies, especially in coco coir and hydroponic systems. Users consistently report quick, noticeable results, establishing it as a reliable component of their feeding routines. The consensus points to its superior quality compared to alternatives, confirming strong value despite the cost. Its concentrated formula is appreciated for ensuring longevity and consistent performance across growing cycles. This product is viewed by many growers as essential for achieving robust plant health.
Know before you buy
No, this formula has an NPK ratio of 0-0-0. It is intentionally designed without primary nutrients so you can supplement calcium, magnesium, and sulfur without altering your existing fertilizer ratios.
This supplement offers precise control over your feeding regimen. It allows you to address specific calcium or magnesium deficiencies or support heavy-feeding plants during rapid growth phases without accidentally over-fertilizing with nitrogen or phosphorus.
Yes, it is designed to be compatible with most base fertilizers, including Roots Organics Buddha Grow and Buddha Bloom. It acts as a secondary nutrient boost to support plant development alongside your primary feeding program.
Yes, it is effective for a wide range of plants, including vegetables, flowers, trees, shrubs, and houseplants. It is particularly beneficial for fast-growing varieties that have high demands for secondary nutrients.
You should use it as a targeted supplement during periods of rapid growth or when your plants show signs of needing extra calcium, magnesium, or sulfur. Because it is a quick-release liquid, it provides these essential elements to the plant efficiently.
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$29