For Coco: Ensure Coco has been buffered with Ca/Mg. Without buffering, Ca and Mg deficiencies are more likely to occur.
Organic Solutions:
• Dolomite Lime (Raises ph in acidic soils and has calcium and magnesium)
• OrganiCAL MAGic by Future Harvest
• Langbeinite
Inorganic Solutions:
• Epsom Salts (Magnesium Sulfate) add to soil or foliar spray
• CalMag Additives: Calnesium by Future Harvest
* Affected leaves usually do not recover from damage even after correcting the problem. *