Nutrients

Third times a charm!

I don't see why not. just ensure your feeding solutions concentration or EC is not to high as it will cause more issues, Good Luck!

Yes, you can. Max. 1.5 ml/l for one week in the middle of flowering.

Yes mate that’s how you are meant to do it. I. Find it best to reduce your a and b by 25% and add 1.5ml/l pk13/14 in week 5 of flower. Only give at this dose for one week. You can also use pk13/14 from week 3-7 at a much lower dose of like 1/2ml/l or less but canna does state that only for a week . Boost can be used throughout flower and also during flush as the boost has no npk value