Humboldts Secret CalMag & Iron | Calcium, Magnesium & Chelated Iron Nutrient Fertilizer | Hydroponic Supplies for Vegetative & Flowering Growth in Soil, Coco, Hydroponics or RO Water | 32 Ounce

Humboldts Secret CalMag & Iron Supplement is a highly effective liquid fertilizer designed to deliver essential calcium, magnesium, and chelated iron to plants in all stages of growth, from early vegetative development to heavy flowering and fruiting. Many flowering and fruiting plants require higher levels of these vital secondary nutrients to maintain optimal growth, and our balanced formula is specifically engineered to correct and prevent common deficiencies that can limit plant health and yield. Calcium helps strengthen cell walls for sturdy stems and resilient foliage, magnesium plays a key role in chlorophyll production for rich green leaves and efficient photosynthesis, while chelated iron ensures proper enzyme function and energy transfer, even in challenging pH environments. Our formula works quickly to address nutrient imbalances, improving nutrient transport and root development so plants can absorb and utilize all essential elements effectively. Suitable for use in hydroponics, soil, and container gardens, this versatile supplement delivers dependable results in both indoor and outdoor systems, whether you are a home gardener or a commercial grower. It is especially recommended for plants grown in coco coir or with reverse osmosis water, where calcium, magnesium, and iron are often depleted and supplementation becomes critical for healthy growth and fruit set. Regular use helps prevent issues such as blossom end rot, leaf yellowing, and weak stem structure, ensuring stronger, more productive plants and higher-quality harvests. Our CalMag & Iron supplement integrates seamlessly into any nutrient program and can be used alongside other fertilizers without causing nutrient lockout. For best results, use as part of your regular feeding schedule to maintain consistent nutrient levels and support the specific needs of your crops. Whether you are cultivating vegetables, herbs, flowers, or fruiting plants.

• Packaging Update: You may receive previous or updated packaging during our transition. Same formula, same performance.
• ‌Strength for Every Stage: Humboldts Secret supplement with cal mag for plants delivers calcium, magnesium, and chelated iron to prevent deficiencies. It fortifies stems, improves leaf color, and supports flowering and fruiting plants for vigorous, healthy growth in any type of garden.
• Fast-Acting Plant Recovery: Our balanced formula with calmag and chelated iron targets issues caused by nutrient imbalances, helping plants recover quickly. It boosts photosynthesis, nutrient transport, and root strength in vegetables, flowers, and herbs grown indoors or outdoors.
• Maximum Absorption Power: Using our cal-mag for plants blend with added iron improves uptake efficiency, ensuring these essential minerals are fully utilized. It supports lush vegetative growth and abundant blooms, delivering consistent results for home or commercial growers.
• Reliable Across All Setups: Humboldts Secret cal mag fertilizer with iron works in hydroponics, soil, and container gardens. It strengthens plant structure, enhances fruit quality, and ensures balanced nutrition in indoor and outdoor systems for dependable, healthy harvests.
• Focused on Fruiting Success: Our formula with calcium and magnesium for plants plus chelated iron benefits crops in coco coir or reverse osmosis water. It helps prevent blossom end rot, promotes firm fruit set, and improves nutrient absorption for strong, productive plants in challenging conditions.