GH Feeding CalMag 1kg. – Calcium-magnesium supplement for plants

Green House Feeding CalMag is a professional mineral supplement developed to provide optimal amounts of calcium and magnesium – two vital elements for proper plant development. Calcium is involved in the construction of strong cell walls, stimulates the development of roots and new tissues, while magnesium is a major component of chlorophyll and plays a key role in photosynthesis.

The product is particularly suitable when using reverse osmosis (RO) water , rainwater or very soft water, where the natural calcium and magnesium content is insufficient. The addition of CalMag restores the mineral balance and prevents the appearance of typical symptoms such as interveinal chlorosis, necrotic spots, deformed leaves and stunted growth.

Thanks to its 100% water-soluble formula , nutrients become immediately available to plants. CalMag can be used via fertigation, hydroponic systems or foliar application, and is compatible with all major Green House Feeding mineral fertilizers – Hybrids, Short Flowering, Long Flowering and Booster, as well as with nutritional programs from other manufacturers.

Composition (EC fertilizer):

✔️ Total Nitrogen (N): 13.5%

• Nitrate nitrogen (NO₃): 13.1%
• Ammonium nitrogen (NH₄): 0.4%

✔️ Calcium oxide (CaO): 16.7% (water soluble)

✔️ Magnesium oxide (MgO): 6.0% (water soluble)

✔️ EC at 1 g/L: 1.2 mS/cm

✔️ Does not contain:

• Chlorine
• Sodium
• Heavy metals

Advantages

✔️ Prevents and corrects calcium and magnesium deficiency

✔️ Suitable for reverse osmosis (RO) water and rainwater

✔️ Improves the strength of cell walls

✔️ Stimulates the development of a strong root system

✔️ Improves photosynthesis and chlorophyll formation

✔️ Promotes the formation of healthy flowers and quality fruits

✔️ Ensures rapid absorption thanks to high solubility

✔️ Compatible with most mineral nutrition programs

✔️ Can be used alone or with fertilizers from other manufacturers

✔️ Does not contain chlorine, sodium and heavy metals

Application

Suitable for:

• Vegetable crops

• Fruit trees

• Flowers

• Ornamental plants

• Hydroponic systems

• Coconut substrates

• Soil cultivation

• Fertigation

• Foliar feeding

• Professional and amateur plant growing

📋 Method of use

Basic dose

✔️ 0.1 – 0.5 g per 1 liter of water

With soft water (RO / rainwater)

✔️ 0.5 g/l water (about 0.6 EC )

With hard water or rich soil

✔️ 0.2 g/l , 1–2 times a week (as needed)

Foliar application

✔️ 0.2 g/l , every 10 days , only if calcium or magnesium deficiency is detected.

For automatic dosing systems

✔️ Preparation of concentrate: 10–15 kg of product per 100 liters of water for systems such as Dosatron , Netafim and others.

⚠️ Important

• Do not mix Green House Feeding CalMag with other calcium supplements.
• When using the Green House Feeding program, you can stop using CalMag around the 6th week of flowering and switch to GHF Calcium Chelate if you wish to continue feeding calcium without additional nitrogen.

💡 Tip from Urban Botaniks: If you use a reverse osmosis (RO) system, Green House Feeding CalMag should be the first addition to the water before other fertilizers. This will restore the necessary calcium and magnesium content and provide an optimal environment for the absorption of all other nutrients. 🌱