They will grow and they will flower. You just will wish that you got more bud because they will act just like an auto but they weren't bread to grow that way..
Something that people seem to forget is that when you grow outdoors the trigger for flowering is different. Indoors we can simply decrease the photo period by 6 hours all at once, where as, of course, we cannot do this outside. Outside, the plants respond to the waning of the photo period. They do not wait for 12 hours of light, they simply respond when they notice the shortening of the days. If this were not true, then plants in Florida would not even begin to bloom outdoors until the end of September or October, but somehow I harvested my bud in October and November when I lived there. If anyone doubts my assertions, then just try it indoors. You can make a plant bud in more than 12 hours of light if you reduce slowly from 18 hours and subtracting 1-2 minutes a day. I have even cut plants from 18 hours to 15 hours all at once and they started to bud, but usually you will see them start at around 14 hours of light if you reduce the light period slowly like I said.