《明史·列传·卷一百六十九》
元末，世道不宁，灌在他房屋周围兴办林场，人们不理解他的这一举动。
元末，世将乱，环所居筑场种树，人莫能测。
In the late Yuan Dynasty, when the world was in chaos, he planted trees around his house to create a forest. People did not understand why he was doing this.