Epsom Salt

It's for sulfur and magnesium. From what I've read it's pretty hard to give a cannabis plant too much Epsom salt but just keep in mind the Ph.
Edit: sulfur and magnesium aren't as important as NPK
 
Epsom salts are about 10% magnesium and 13% sulphur. Both are part of a balanced plant diet. But should be treated accordingly. So- try to know what you’re feeding your plants and whether or not they need ES, and if so, how much.
 
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