at what point do I put the plants in flower mode

[bigslick]

at what point do I move my plants into flower mode and should I make them 18-6 dark?

[Mr.furley]

It will depend on how old the plants is and how much room you have. Photoperiod plants will flower with 12-12 light not 18/6.

[SoOrbudgal]

Ditto what Mr.furley said. 12-12 for photo plants.

[9fingerleafs]

you move your plants into flower with light 12 hours on 12 hours off. at least 6 to 8 weeks old