If a plant is in flower outdoors getting 9 hours and it was brought indoors an put on 12/12, could the increase cause it to re-veg or would it stay in flower?
I've never done what you've done but I would imagine you should match the 9 hour light time to start and then expand it slowly to 12/12 to avoid shocking the plant.
If a plant is in flower outdoors getting 9 hours and it was brought indoors an put on 12/12, could the increase cause it to re-veg or would it stay in flower?
It will stay in flower and imo will flower better now its getting more hours of light. as above you would need to go above 15 hours of light for it to go back to veg and this is very stressful for the plant.