k i have 4 plants they r only under flourecent light right now but i think i have 2 dif strains indica grows short right and does sativa grow tall?anyway i think 2 of my plants my be indica strain and the others sativa they all have the exact same amount of nodes of leaves coming in but 1 is 9inch 1 is 7 1/2 inch and the other 2 r like 5 1/2 inch the two tall ones look very simaler and the short ones look the same there 30 days old now and have there 7th node of leaves and the 8th comeing in when is the earliest time i can go to 12/12?
I'd say top the two big ones or start training them so the shorter ones can catch up then switch to 12/12.