Because it's not there at all. That's why Bo Wanyue can't do anything to me. He can only watch while I'm cultivating outside! If there were big trees alive, there would be no need to look at them like this. Ji Ning said, until I am about to break through the Dao Guard Tower. He was anxious and probably asked for help from the top brass of the Sith clan. So the big tree life was sent over....