can i force outdoor plants to start flowering?

Hey all......kinda new to this, my second year growing outdoors. I was wondering if there is anyway to force my baby's to start flowering??....they are in containers, so can be moved.I am in the Northwest, and we have not had a very warm or sunny summer.......plants are over 2 foot, with lots of leaves and very hearty stalks.....any thoughts would be appreciated
Thanks all
Happy toking

Yes, their is. but you dont need to, it should/will begin flowering on its own any day now. Taking it inside or covering it for 12 hours will just give it less energy to start flowering with.