27% under what the other stores charge
Compared across 4 stores. Prices are checked against each store and labelled with when.
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In stockSold by HS SuppliesReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
In stockSold by HS Supplies
In stock
Availability unknown
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Lowest price we've seen: $13.97 on Nov 11 at Amazon. Tracked across 3 stores since Nov 11.
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.
