12 indica plants, started flowering at 12 inches tall, will get almost 3 ft tall, by harvest. Read up on STRETCHING, they spread upward making room for the buds. If they are crowded in a sea of green, you'll get 1/4 oz per plant. maybe some more FLUFF buds. If they are individuals, growing separately, but close together,and you have the lights, you might get 12 oz to 36 ounces from the 12. I have seen one 8 ounce bud off of one plant but do not expect that.