Stickanswered grow question 7 years ago Nope, blooming nutrients should only be used once your plant shows pre-flowers. You should refer to GHE feeding schedule, and try 1/4 to 1/2 of their recommended doses. About CO2, you can find CO2-bags ready-to-use, that's probably the simplest solution. You just have to open the top of the bag, and CO2 will be delivered slowly through your airflow. I'll be around, good luck with these babies!