Radical Adjustment (Affects plant's growth?)

Alright, I'm just looking for a little input that might help me get a few answers. I'll provide a example of my situation:

Hypothetically, how would this situation affect a plant. Six indoor plants have been growing for three years in a greenhouse type environment. If these plants were transferred suddenly too a outside environment, would the plant's still grow. Or would the harsh adjustment of environments cause it too die or become unhealthy. Keep in mind, the change would take place overnight.