Botanicare Cal-Mag Plus
Best mineral supplement for indoor gardeners using coco coir or RO water.
Botanicare Cal-Mag Plus is a highly fortified plant supplement designed to correct common deficiencies in calcium, magnesium, and iron. It is strongly recommended when using reverse osmosis water or growing in coco coir-based media to counteract natural calcium draw. This versatile product can be integrated into your existing nutrient program or applied directly as a foliar spray to further enhance plant growth. Available in various sizes, it offers a reliable solution for maintaining essential mineral balance in your indoor garden setup.
$17.20
Owner Satisfaction
4.7
/ 5
Category Rank
50
/ 4352
#50 in Fertilizers
Price vs Category Average
-72%
Below average
NPK Ratio
200
/ - -
Who it's for
- Indoor growers seeking to maximize photosynthetic efficiency
- Cultivators managing diverse setups like hydroponics and soil
- Gardeners struggling with yellowing leaves or stunted plant growth
Who should skip it
- Novice growers prone to accidental over-fertilization
- Busy gardeners wanting to avoid frequent pH adjustments
- Budget-conscious growers using complete base nutrient lines
Performance breakdown
Deficiency Correction
Rapidly resolves common calcium and magnesium lockouts in demanding grow media.
Media Compatibility
The gold standard for stabilizing coco coir and reverse osmosis setups.
Nutrient Integration
Seamlessly layers into almost any existing liquid fertilizer feeding schedule.
Foliar Efficacy
Highly effective as a direct spray for quick, targeted mineral absorption.
Formula Concentration
Potent liquid concentrate ensures high mineral availability with minimal dosage.
Scaling Versatility
Available in sizes ranging from hobbyist quarts to industrial-scale drums.
Key Specs
NPK Ratio
2 - 0 - 0
Contains Calcium, Magnesium, and Iron
Available in multiple sizes
Quart, Gallon, 2.5 Gallon, 5 Gallon, 55 Gallon, and 250 Gallon
Fertilizer Source
Mineral Based
Nitrogen Percentage
2.0%
Phosphorus Percentage
0.0%
Potassium Percentage
0.0%
Application Method
Foliar Spray
Features
- Corrects calcium, magnesium, and iron deficiencies
- Essential for RO water and coco coir
- Boosts plant growth
- Fortified formula for high mineral availability
- Versatile application methods
- Supports healthy plant development
What customers say
Customers regard Botanicare Cal Mag Plus as an essential, high quality nutrient supplement. The core focus is its effectiveness in rapidly resolving calcium and magnesium deficiencies across different growing environments. Users appreciate how easily it integrates into current feeding routines, praising its consistent solubility and dependable performance. This product is viewed as a foundational staple, delivering significant value by promoting strong plant health and proactively preventing common problems. Its reliability makes it a trusted choice for growers.
Know before you buy
Coco coir has a natural tendency to bind with calcium and magnesium, which can lead to deficiencies in your plants. Using Cal-Mag Plus helps counteract this 'draw' and ensures your plants receive the essential minerals they need to thrive in that specific medium.
Yes, Cal-Mag Plus is designed to be a supplement rather than a replacement. It integrates easily into almost any existing nutrient program to provide an extra boost of calcium, magnesium, and iron.
RO water is stripped of almost all minerals, including calcium and magnesium. Adding Cal-Mag Plus is highly recommended when using RO water to restore the necessary mineral balance your plants require for healthy development.
Yes, this product is versatile and can be applied directly to the leaves as a foliar spray. This method is an effective way to quickly address visible deficiencies or provide a rapid mineral boost to your plants.
Botanicare Cal-Mag Plus has an NPK ratio of 2-0-0. This means it provides a small amount of nitrogen to support growth, but it is primarily formulated to deliver calcium, magnesium, and iron rather than primary macronutrients.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$17