I am a first time grower and I have just started to notice some brown spots developing on my Black Jack auto. I at first diagnosed it as a calcium magnesium issue. do I bought some fox farm cal mag and treated as per label of 1tsp per gallon. Over the past few days I have noticed more leaves with spots. I have attached a few pics of the issue
Are you checking the ph of your soil? Just because you are adding cal mag your plant may not be taking it in because of bad ph levels in your soil…I have been having the same issue and finding out somehow the ph of my soil is at like 5.8 - 6. I have bought a bag of pulverized garden lime to help amend the issue.