When did you plant them?

What's the strain?

What are the conditions they are in outside?

If they're not getting the correct Light : Dark time ratio then that could explain your problem
SunnyD Reviewed by SunnyD on . marijuana plants not flowering i have an outdoor grow going in the northern us, plant r growing beautifully but the havent started to flower, hell they havent in even started showing sex yet! Rating: 5