FoxFarm Cal-Mag (1 qt)

Gringo Rasta Cal-Mag from FoxFarm is a concentrated nutrient supplement that delivers two essential minerals—calcium and magnesium—to promote strong, healthy plant growth. These nutrients are critical for cell wall development, enzyme activity, and the production of abundant fruits and flowers.

This convenient 1-quart size is perfect for smaller gardens, container plants, or indoor growing setups where precise nutrient management is essential. Cal-Mag helps correct and prevent common deficiencies that can cause issues like weak stems, blossom end rot, or reduced flower quality. The formula is OMRI Listed and CDFA Organic Input Material approved, making it suitable for certified organic production. Containing 3% calcium and 0.9% magnesium, it’s derived from calcium carbonate, magnesium sulfate, and soy protein hydrolysate for effective absorption.

Whether you’re feeding vegetables, herbs, fruiting plants, or ornamentals, this nutrient boost supports overall plant vigor and improves your harvest quality.

For more organic plant nutrition options, visit our Fertilizer & Growing Supplies collection.

• Size: 1 quart
• Calcium Content: 3%
• Magnesium Content: 0.9%
• Best For: Small gardens, indoor plants, container growing
• Organic Certification: OMRI Listed, CDFA Organic Input
• Derived From: Calcium carbonate, magnesium sulfate, soy protein hydrolysate

How FoxFarm Cal-Mag (1 qt) fits a fertility plan

• Supplies calcium and magnesium for fertility programs where soil, water, tissue testing, or a well-supported diagnosis indicates a need.
• A nutrient-specific amendment allows more precise correction than adding another broad, complete fertilizer.
• The package size and dry or liquid format shown in the title can be matched to the application equipment and growing area.

Application guidance: Confirm that calcium and magnesium availability is actually limiting before application; pH, root health, salinity, and overwatering can produce similar symptoms. Follow the label rate and placement method, measure carefully, and avoid repeated applications without retesting. Nutrient excess can interfere with uptake of other elements.

Compare related secondary and micronutrient fertilizers when building a complete program.