Marijuana plants respond in a predictable manner to changes in the lighting regimen. Given 12 hours of uninterrupted darkness each day, the plants change from vegetative growth to flowering. Inversely, plants which have been under the flowering regimen of 12 hours of uninterrupted darkness each evening, can be forced back into vegetative cycle using continuous lighting.

To force plants from flowering to vegetative growth, cycled light is replaced by continuous lighting. When the ripe buds are pruned from the plant, some vegetation, the lower portion of the bud, is saved. New growth will emerge from this vegetation within a few weeks of forcing.

The plants can be any size, but they must retain some leaf matter to regenerate.
end of ED

this is dirty now,
so if the sun in the sky is increasing are plants will turn back to veg.