Growlog link: [paste your link here]
If you don’t have a growlog please answer these questions.
What strain are you growing? Is it Auto, Fem or Reg?
Are you growing Indoor or outdoor?
Are you using nutrients? Which ones? How much?
Welcome to the community @kalou , if it is not an automatic plant, it will start switching to flowering from 14 hours of daylight down to 12 hours of daylight at the latest. You will notice it because it starts stretching very quickly and the first signs of flowers appear.
Thank you for your response ok I understand better
@kalou If you have any more questions, don’t be shy to ask them. There are many experienced growers here who will gladly help you.
Is the plant doing well? I feel like it’s not very full of branches and foliage, is that normal??
I think she looks very good and healthy. She will stretch quite a bit when the time comes, keep us updated.
Ok, no problem, thanks for the info, I’ll be sure to 
Welcome and good luck and success with your grow