m0useanswered grow question 3 years ago Depends how old that plant is.
With photoperiods,the plants need time to become mature and then they will start to flower.
Sometimes this is 3-5 weeks for some strains.d
This is why seeds will not flower as soon as they sprout on 12/12. They have a build themselves up a bit before they are ready.
Think of it like puberty in humans and reproducing.
Give it some time and it will reward you. The yellow areas in the middle of new growth maybe from to intense of light.
Check your grow setup, and if you need anymore help try linking your Diary to the question.
Good Luck!