I've read where growers use it in their super soils and I know an outdoor grower that uses Epson salt, wood ash and several other things in the fall to prepare for the next years grow. I have a box of Epsom salt that I purchased over 3 yrs ago, but have never used it, as I don't know the dosage. Nor do I want to cause some type of imbalance in my soil. I also have some olster shell I've never used.
If Mg is needed very fast you can do a 2% solution ( 100ml 2g salt ) and spray it on the leafes for faster reaction. ( dont do this in bloom, only in veg)
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