Cat, my cal Mag suggests 1 teaspoon per gallon. It recommends being used every other feed. I have read somewhere that I could use half strength every feed. I am also growing in soil, so I have no clue what to do with coco.
The pineapple express is about 16 inches tall. However, I started another pineapple express 2 weeks after that one and its my tallest plant at 23inches. You can always start it and LST or supercrop or even scrog if you think it is going to get to big.. Hope that helps! Any questions that I can answer I am more than happy to do so.
@Vlad The Inhaler .. I hope she tastes as good as she smells.. If she does. I will only grow pineapple express.. Who am I kidding, I have try all the strains I have seen you folks growing.