Humboldts Secret CalMag & Iron Plant Supplement
Humboldts Secret CalMag & Iron – Calcium, Magnesium & Iron Supplement for Plants
Boost your plant’s nutrient uptake and resilience with Humboldts Secret CalMag & Iron—a concentrated solution delivering the perfect balance of calcium, magnesium, and iron to correct common deficiencies and promote healthy, vigorous growth.
Formulated for use in all growing environments—including soil, coco coir, hydroponics, and reverse osmosis (RO) systems—this supplement is particularly beneficial for flowering plants that demand more micronutrients than base nutrients can provide. Whether you're dealing with stunted growth, leaf discoloration, or poor fruit development, CalMag & Iron ensures your plants receive the essential support they need to thrive.
Key Features & Benefits:
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Corrects Common Deficiencies: Provides precise levels of calcium, magnesium, and iron for robust plant development
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Supports Healthy Growth: Improves branch strength, nutrient transport, and flowering
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Ideal for Coco Coir & RO Water: Designed for mediums where these nutrients are often lacking
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Flexible Application: Use as a root drench or foliar spray; compatible with all grow systems
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Highly Concentrated Formula: A little goes a long way—saves money without compromising results
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No Harmful Additives: Made with clean, high-quality ingredients—no dyes, no banned PGRs
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Stackable: Works seamlessly with Humboldts Secret Base A+B and Golden Tree
How to Use:
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Mix 2–5 ml per gallon of water
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Use 1–3 times per week depending on plant needs
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In hydroponic or aeroponic systems, start with half the dosage
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Can be used as a foliar spray or root drench
Pro Tip: 5 ml = 1 teaspoon. Always check plant response and adjust accordingly.
FAQ Highlights:
Can I use this with Golden Tree?
Yes! CalMag & Iron is compatible with Golden Tree and other Humboldts Secret nutrients.
How often should I apply?
Use 1–3 times per week based on your plants’ response and growing environment.
Is it safe for all plants?
Absolutely. It’s safe and highly recommended for all flowering and fruiting plants.
Does it contain any harmful PGRs?
No—Humboldts Secret products never contain banned or harmful plant growth regulators.