Botanicare Cal-Mag Plus Plant Supplement - Corrects Calcium

In this review of Botanicare Cal-Mag Plus the bottom line is simple: this concentrated 2-0-0 supplement is aimed at growers who need a reliable correction for calcium and magnesium deficiencies. The reviewer found it most valuable for those using reverse osmosis water or coco coir medias where calcium draw is common, and appreciated that it can be added to a regular nutrient program or used as a foliar spray. The formula also includes iron, which helps green-up plants showing nutrient imbalance, making it a practical addition for gardeners focusing on strong vegetative growth and healthy transitions into bloom.

Key Features

• Highly fortified formula: Provides concentrated calcium, magnesium, and iron to correct common nutrient deficiencies in a single product.
• Corrects deficiencies: Helps reverse symptoms of calcium and magnesium lack so plants show steadier growth and fewer tip burns.
• Use across growth stages: Safe for vegetative, transition, and bloom stages to maintain consistent nutrient availability.
• Recommended for RO water: Compensates for minerals stripped by reverse osmosis systems so growers maintain balanced feed water.
• Works with coco media: Addresses natural calcium draw in coco coir based medias to prevent deficiency-related growth issues.
• Foliar application option: Can be applied as a foliar spray to quickly address leaf symptoms and boost short-term uptake.

Who It's For

Botanicare Cal-Mag Plus is best for hobby and small commercial growers who supplement with custom nutrient programs, especially those using reverse osmosis water or coco coir. The product suits growers who need a targeted correction for calcium and magnesium while keeping a simple dosing routine.

Growers who already use a complete calibrated nutrient line without mineral depletion or who prefer single-ingredient amendments for each mineral might look elsewhere; this product is optimized as a combined Ca-Mg-Fe supplement rather than separate, granular control of each element.

Pros & Cons

Pros

• Concentrated triple-action formula supplies calcium, magnesium, and iron in one addition for ease of use.
• Recommended for reverse osmosis and coco systems where mineral depletion is common, providing reliable correction.
• Flexible use across vegetative to bloom stages and as a foliar spray speeds recovery from deficiency signs.

Cons

• Combined formulation reduces the ability to fine-tune each mineral independently for growers who need that level of control.

Specifications

Product name	Botanicare Cal-Mag Plus
Analysis	2-0-0 (Calcium, Magnesium, Iron)
Primary nutrients	Calcium, Magnesium, Iron
Recommended use	Vegetative, transition, and bloom stages
Application	Root feed or foliar spray
Recommended for water types	Reverse osmosis and depleted water supplies
Media compatibility	Coco coir based medias and traditional media

Our Verdict

Botanicare Cal-Mag Plus is a sensible, cost-effective supplement for anyone dealing with calcium or magnesium shortfalls, particularly when using RO water or coco coir. Its combined Ca-Mg-Fe formulation simplifies supplementation and the foliar option aids quick recovery, making it a practical addition to most nutrient programs where steady plant health is the priority.

Frequently Asked Questions

Can I use this with reverse osmosis water?
Yes. It is strongly recommended for RO water to replace minerals removed by filtration and prevent deficiencies.

Is it safe during bloom?
Yes. The formulation is intended for use during vegetative, transition, and bloom stages to maintain nutrient balance.

Can it be applied as a foliar spray?
Yes. Cal-Mag Plus can be mixed for foliar application to help quickly correct leaf deficiency symptoms.