The_420answered grow question 6y ago Hello
Canna Boost is applied as soon as the plants start to flower, so at the first week of flowering. Be careful not to mix it with hydrogen peroxide (H2O2). Use the diluted solution within a maximum of 4 days.
You can switch to flowering now, but you can also continue your vegetative phase. It's up to you; personally, I switch to flowering from the 21st day, but I'm not using LED.
I hope these tips help you, happy growing 😊