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If your talking about the micro nutrient found in Epson Salt for example. I've read about it before but I forget what function it plays in a plants physiology. Maybe somebody else recalls.
 

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Magnesium (Mg)
Magnesium is part of the chlorophyll in all green plants and essential for photosynthesis. It also helps activate many plant enzymes needed for growth.
Soil minerals, organic material, fertilizers, and dolomitic limestone are sources of magnesium for plants.
 
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