Présentation du produit
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Mills CalMag: The CalMag Plant Fertilizer to Prevent Calcium and Magnesium Deficiencies
When cultivating in coco or hydroponics, calcium and magnesium deficiencies are among the most frequent and detrimental problems for plant development. Mills CalMag is a liquid nutritional additive formulated to precisely meet this need, providing high concentrations of calcium, nitrogen, and magnesium in a format directly assimilable by your plants.
At GrowLED, we appreciate the clarity of this product's composition: no frills, precise figures, and simple use that integrates seamlessly into any nutrition program, whether you're in growth or flowering. Mills CalMag is available in three sizes — 1L, 5L, and 10L — to suit both small indoor gardens and larger cultivations.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Liquid CalMag Additive |
| Calcium (Ca) | 13.1% w/w |
| Nitrogen (N) | 8.3% w/w |
| Magnesium (Mg) | 2.5% w/w |
| Application Phase | Growth and Flowering |
| Compatible Cultivation Type | Coco, Hydroponics, Soil |
| Dosage in Growth | 0.5 to 1 ml/L |
| Dosage in Flowering | 0.5 to 1 ml/L |
| Available Sizes | 1L (NS-MILS0031), 5L (NS-MILS0032), 10L (NS-MILS0033) |
| Brand | Mills Nutrients |
Usage Guide
Mills CalMag is used at a rate of 0.5 to 1 ml per liter of water, both during the growth phase and flowering. Start with the lower dose (0.5 ml/L) if your plants do not yet show signs of deficiency, and gradually increase to 1 ml/L if you observe symptoms such as chlorotic spots on leaves or interveinal yellowing, classic signs of magnesium deficiency.
In coco and hydroponic cultivation, the supply of calcium and magnesium is particularly critical because these substrates and systems do not naturally retain these elements as good soil can. It is therefore recommended to integrate Mills CalMag from the first watering and maintain it throughout the cycle, adjusting the dose according to the evolution of your plants and the analysis of your nutrient solution.
Always add Mills CalMag to your water before incorporating other base fertilizers, to avoid any undesirable precipitation or chemical interaction. Mix well after each addition and check your pH before watering: a well-balanced solution is the basis for optimal nutrient absorption.
In soil cultivation, the use of Mills CalMag remains relevant, especially if you use reverse osmosis or very soft water, or if your substrate is poor in calcium. In this case, a dose of 0.5 ml/L is usually sufficient to supplement the natural soil supply without risking unbalancing your solution.
Compatibility and Associations
Mills CalMag is designed to integrate into the Mills Nutrients ecosystem, but it is also compatible with most fertilizer programs on the market. Its role is complementary: it does not replace your base fertilizer; it supplements it by filling in calcium and magnesium inputs that standard formulas do not always cover sufficiently, especially in coco and hydroponics.
For complete and consistent nutrition, the GrowLED team recommends combining it with Mills Vitalize, a silica-based biostimulant that strengthens the cellular structure of your plants and improves their stress resistance. Silica and calcium work synergistically to solidify cell walls and make your plants more robust against temperature or humidity variations.
In advanced flowering, you can also combine Mills CalMag with Mills Ultimate PK, the phosphorus-potassium booster from the range, to maximize flower development while maintaining a stable calcium supply that prevents apical necrosis. And if you want to go even further in stimulating your plants at the end of the cycle, check out Mills Star, the finishing additive from Mills Nutrients that prepares your plants for harvest in the best conditions.
Frequently Asked Questions
Why use a CalMag plant fertilizer in addition to my base fertilizer?
Most base fertilizers contain calcium and magnesium, but often in insufficient quantities for coco or hydroponic cultivation. These substrates and systems do not retain these elements as soil does, which quickly creates deficits. Mills CalMag fills this gap with concentrated and directly assimilable inputs, without overloading your nutrient solution with superfluous elements.
Can Mills CalMag be used with tap water?
Yes, absolutely. If your tap water is already rich in calcium (hard water), adjust the dose downwards, around 0.5 ml/L, to avoid an excess of calcium that could block the absorption of other nutrients like magnesium or potassium. If you use reverse osmosis or very soft water, you can go up to 1 ml/L without any problem.
Is Mills CalMag usable in flowering without risking too much nitrogen?
The nitrogen content of Mills CalMag is 8.3% w/w, which is significant. In advanced flowering, if you are already reducing nitrogen in your base solution, monitor the total input so as not to exceed your plants' needs. At 0.5 ml/L, the nitrogen input remains moderate and should not pose a problem in most flowering programs.
Which size to choose between 1L, 5L, and 10L?
It all depends on the size of your cultivation and the frequency of use. The 1L size is ideal for a small growing space or for testing the product. The 5L is suitable for a medium-sized cultivation with regular watering. The 10L is designed for growers who manage large volumes of nutrient solution and want to limit frequent reordering.
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