Mad Farmer Cal+Mag
Best nutrient supplement for growers using coco coir or purified water.
Mad Farmer Cal+Mag is a liquid concentrate designed to enhance plant nutrition and prevent common deficiencies. It provides readily available Calcium and Magnesium, crucial for robust plant growth and preventing issues like blossom end rot, especially when using RO water or coco coir. This supplement can be used with every feeding or as a foliar spray, integrating seamlessly with any nutrient program. Its dye-free formula ensures it won't alter nutrient solutions, promoting vigorous development in a wide range of plants.
$115.70
Owner Satisfaction
4.7
/ 5
Category Rank
50
/ 4425
#50 in Fertilizers
Price vs Category Average
+88%
Above average
Package Weight
23.6
/ lbs
Who it's for
- Botanists aiming for maximum chlorophyll production and nutrient absorption
- Gardeners needing immediate solutions for yellowing or stunted plants
- Budget-conscious growers seeking a potent, long-lasting nutrient supplement
Who should skip it
- Novice gardeners prone to over-fertilizing their sensitive crops
- Beginners who prefer a low-maintenance, set-it-and-forget-it feeding routine
- Busy growers wanting a simple, all-in-one mixing process
Performance breakdown
Nutrient Bioavailability
Rapidly corrects deficiencies with highly accessible calcium and magnesium ions.
Medium Compatibility
Essential for stabilizing coco coir and RO water nutrient profiles.
Formula Purity
Dye-free composition keeps your reservoir clean and visual monitoring simple.
Application Versatility
Seamlessly transitions between root zone feeding and direct foliar application.
Concentration Efficiency
High-potency liquid requires minimal volume for effective nutrient supplementation.
System Integration
Neutral chemistry ensures zero conflict with existing base nutrient programs.
Key Specs
Package Weight
23.6 lbs
Form
Liquid Concentrate
Application Volume
1-15 mL per gallon (feeding)
Foliar Application Rate
5 mL per quart
Fertilizer Source
Synthetic
Application Method
Foliar Spray
Season of Application
All Season
Container Weight
23.6 lbs
Features
- Essential Calcium and Magnesium supplement
- Prevents nutrient deficiency disorders
- Ideal for RO water and coco coir
- Use with every feeding
- Foliar spray compatible
- No added dyes
- Supports vigorous plant growth
- Compatible with all nutrient programs
What customers say
Growers highly value Mad Farmer Cal+Mag for its exceptional effectiveness and strong value. This product reliably corrects common calcium and magnesium deficiencies swiftly, promoting healthier and more vigorous plant development. Its concentrated formula offers an economical choice, delivering professional results without excessive cost. Customers consider this a dependable staple in their nutrient regimen, appreciating the high quality performance that justifies the investment.
Know before you buy
Reverse osmosis water is stripped of essential minerals, which can lead to nutrient deficiencies in your plants. Adding this supplement replaces the calcium and magnesium that are typically missing from purified water sources.
Yes, Mad Farmer Cal+Mag is designed to be compatible with all nutrient programs. Because it is dye-free, it will not interfere with the color or chemistry of your current feeding solution.
You can use this supplement with every feeding to maintain optimal nutrient levels. It is also safe to use as a foliar spray if you need to address a deficiency more quickly.
Absolutely. Coco coir has a natural tendency to bind with calcium and magnesium, often leading to deficiencies; using this supplement helps ensure your plants receive the nutrients they need to thrive in that medium.
For foliar feeding, mix 5 mL of concentrate per quart of water. Ensure you spray during the cooler parts of the day to avoid leaf burn.
No, the formula is dye-free and highly water-soluble. It is designed to stay in solution without leaving behind unwanted pigments or sediment.
Still have a question?
Ask Hayley anything about this product before you decide.