You can use it throughout the grow up until 5-14 days prior to harvest when you flush. Just be careful going into flower... Most CalMag also has nitrogen in it and too much nitrogen going into flower can lead to a disaster. I often times stop CalMag weeks 1-2 or 2-3 of flower then re-introduce in week 4 or 5 of flower until flush.
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You can use it throughout the grow up until 5-14 days prior to harvest when you flush. Just be careful going into flower... Most CalMag also has nitrogen in it and too much nitrogen going into flower can lead to a disaster. I often times stop CalMag weeks 1-2 or 2-3 of flower then re-introduce in week 4 or 5 of flower until flush.