These plants have taken being topped , fimmed , trained and pruned like Champs! They recover from anything in 2 days that I have thrown at them. Go to my Facebook group called "introduction to Growing medical marijuana" to see a lot more videos and updates on the techniques I have used on them!
https://www.facebook.com/groups/558575211781784/?ref=share
As far as nutrients go I have only given them molasses and liquid kelp and water.