Grow More® Flowering Cal-Mag — 6 gal

Nitrogen-Free Calcium and Magnesium Supplement for Maximum Fruit and Flower Yield

Grow More® Flowering Cal-Mag is a specialized hydroponic plant nutrient solution featuring a proprietary, nitrogen-free blend of calcium and magnesium formulated specifically for the demands of fruiting and flowering crops. By eliminating nitrogen entirely, Flowering Cal-Mag allows growers to precisely supplement calcium and magnesium during bloom and harvest phases without accidentally stimulating additional vegetative growth — delivering targeted secondary nutrient support exactly when and where it’s needed most. Available in 6 gal.

Key Features & Benefits

• 100% Nitrogen-Free: The only readily available nitrogen-free calcium and magnesium supplement — allowing precise Ca-Mg correction during flowering and fruiting without the risk of excess vegetative growth stimulation from added nitrogen.
• Enhances Fruit and Flower Yield: Adequate calcium and magnesium during reproductive development directly supports cell division, fruit set, seed development, and the structural integrity of flowers and fruit.
• Prevents Blossom End Rot: Blossom end rot is a classic symptom of calcium deficiency in fruiting crops. Flowering Cal-Mag delivers immediately available calcium to correct and prevent this yield-limiting disorder without introducing nitrogen that could disrupt the flowering stage nutrition balance.
• Improves Water and Nutrient Uptake: Adequate calcium supports healthy root membrane function and improves the efficiency of water and nutrient absorption, contributing to more productive and consistent crop performance.
• Multi-System Compatible: Formulated for use in coco coir, soil, and hydroponic growing systems — one product for all substrates and delivery methods.
• Proprietary Calcium and Magnesium Blend: Derived from Calcium Citrate, Calcium Glucoheptonate, Calcium Carbonate, Calcium Acetate, Magnesium Acetate, Magnesium Glucoheptonate, and Magnesium Citrate for superior solubility and bioavailability.

Who Should Use This

Flowering Cal-Mag is essential for any grower who needs to supplement calcium and magnesium specifically during the flowering and fruiting phase without adding nitrogen to their nutrient program. It is particularly valuable in coco coir growing (where coco has a high cation exchange affinity for calcium), in hydroponic systems using RO or soft water, and for growers running bloom-phase nutrient programs where additional nitrogen would be counterproductive.

Compatibility

Flowering Cal-Mag is compatible with all growing substrates including coco coir, soil, soilless mixes, and all hydroponic delivery systems. It can be used alongside any base nutrient program — simply add to your reservoir or irrigation water at the recommended rate. Pair with other Grow More Mendocino supplements for a complete bloom-phase nutrition program. Available in 2.5-gallon and 6-gallon sizes.

Frequently Asked Questions

Why is it important to use a nitrogen-free Cal-Mag during flowering?

Most flowering and fruiting crops are fed a reduced-nitrogen nutrient program during the bloom phase to direct energy toward reproductive development rather than vegetative growth. Standard Cal-Mag supplements often contain nitrogen, which can partially counteract this approach. Flowering Cal-Mag provides the calcium and magnesium plants need during bloom without any nitrogen that could stimulate unwanted foliage growth.

How is this product different from Grow More Mendocino N-Cal-Mag?

N-Cal-Mag contains 2.2% nitrate nitrogen in addition to calcium and magnesium, making it best suited for vegetative growth phases when nitrogen is needed alongside Ca-Mg support. Flowering Cal-Mag is 100% nitrogen-free, making it the appropriate choice during flowering and fruiting when nitrogen should be minimized.

What causes blossom end rot and how does Flowering Cal-Mag prevent it?

Blossom end rot is caused by inadequate calcium availability at the developing fruit tip during rapid cell division. Because calcium is relatively immobile in plants, it must be continuously supplied through the root zone at adequate concentrations to meet demand. Flowering Cal-Mag delivers immediately available calcium in bioavailable forms to correct this deficiency at the tissue level.

How much Flowering Cal-Mag should I add to my reservoir?

Application rates depend on your base nutrient’s existing calcium and magnesium content and your water source. Start at the lower end of the recommended range and adjust based on plant response, EC targets, and any deficiency symptoms. Always refer to the Grow More product label and your base nutrient’s feed chart for specific dosing guidance.

Can Flowering Cal-Mag be used as a foliar spray during flowering?

Foliar application during late flowering is generally not recommended to protect flower and fruit quality. For acute calcium or magnesium deficiency during the flowering phase, root drenching is the preferred application method to deliver nutrients without risk of foliar damage to developing blooms or fruit.