Mr. Grow It, thank you for all the information that you provide the community. I love all the YouTube videos, they really helped me get through my first grow smooth. I'm now on my 2nd grow and I wanted to run this by you. I'm growing some Amnesia Haze which has a 12-14 week flower time. My first grow ran about 8-9 weeks of flower and I was successful in cutting out the CalMag around week 3 of flower. I'm now in week 4 of flower with the Amnesia Haze and I'm getting some brown spots/rust spots on my lower leaves. Do you think this is an early sign of Calcium or Magnesium deficiency? Should i be feeding the CalMag later into flower now that I'm running a longer flowering period? If so, when would you suggest i cut out the CalMag?
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Yup, you can re-introduce CalMag. I sometimes cut out CalMag weeks 1-3 or 2-3 of flower and then re-introduce later. A dosage 5-10ml per gallon should stop the spotting. You can stop using CalMag the same time you stop using your base nutrients about 5-14 days prior to harvest. I say 5-14 days because some prefer to only do 5 days of "flush period" while others like to do a 2-week flush period.