Botanicare Cal-Mag Plus Plant Supplement - Corrects Ca Mg Deficiencies

Our review of Botanicare Cal-Mag Plus finds it best suited for growers who need a targeted correction for calcium and magnesium shortages. The bottom line: this 1-gallon supplement is a straightforward, concentrated add-on to an existing feeding program that supplies highly fortified calcium, magnesium, and iron to prevent common deficiencies. It is designed to mix with every watering or to be applied as a foliar spray when quicker uptake is desired, making it valuable for container, coco, hydrogarden, and soil growers who want a simple way to shore up micronutrients without changing their base nutrient lineup.

Key Features

• Highly fortified formula: Provides concentrated calcium and magnesium to correct deficiency symptoms and strengthen plant structure.
• Iron included: Adds iron to support chlorophyll production and reduce yellowing between veins.
• Flexible application: Can be mixed into the reservoir or used as a foliar spray for faster correction of issues.
• Broad growing use: Formulated for containers, coco, hydrogardens and soil so it fits into many common setups.
• Compatible supplement: Intended to supplement an existing nutrient program without replacing base NPK feeds.

Who It's For

Botanicare Cal-Mag Plus is aimed at hobbyist and small-scale commercial growers who already use a separate base nutrient and need a reliable source of calcium, magnesium, and iron to prevent interveinal chlorosis and blossom end rot-type symptoms. It is useful for those growing in inert media such as coco or hydroponic setups where Ca and Mg are often lacking, as well as potted plants in soil that show deficiency signs.

Growers who prefer an all-in-one complete nutrient may want to look elsewhere, since this product is explicitly a supplement (2-0-0 NPK) meant to be added to an existing program rather than replacing primary feeds. Those needing exact ppm dosing guidance beyond "mix well and use with every watering" should plan to consult specific feeding charts or a lab for water hardness measurements.

Pros & Cons

Pros

• Concentrated levels of calcium and magnesium effectively target common deficiency symptoms.
• Includes iron for improved leaf color and chlorophyll support.
• Versatile use as a root drench or foliar spray for faster correction when needed.

Cons

• Not a complete nutrient solution - intended only as a supplement and carries a 2-0-0 NPK rating.
• Label guidance is brief; precise dosing for all systems requires user judgment or external charts.

Specifications

Our Verdict

Botanicare Cal-Mag Plus is a practical, concentrated supplement for growers who need to correct or prevent calcium and magnesium deficiencies without overhauling their nutrient regimen. Its inclusion of iron and foliar spray option add utility, and for those who already use a base fertilizer this 1-gallon option represents good value as a targeted corrective.

Frequently Asked Questions

Can this be used as a foliar spray?
Yes, the product can be applied as a foliar spray for enhanced growth and faster nutrient uptake when needed.

Is this a complete fertilizer?
No, it is formulated as a supplement with a 2-0-0 NPK and is intended to be used alongside a full nutrient program.

Which growing media is it suitable for?
It is suitable for containers, coco, hydrogardens, and soil as a corrective supplement.