Calmag

It all depends...but sometimes within days. If you have a heavy magnesium deficiency, you can mix Epsom salt with water and spray the leaves....and see results / improvement over night.
 
So the brown will stay on them but the rest will stop turning and stay green? Will I see this like over night or it will take a couple days?? Should I still remove the entire leaf or just the brown part?
 

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Your growing hydro? What are you feeding them? Cal/mag is usually a cocoa issue proper hydro nutes will have enough cal/mag in them
 
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