Also, if you are having trouble finding said spot, look on your map. The ground will be a darker shade of green. As Gunther said, you can wall it off, or. I may be off, it's been a while since I played, waiting for new content to do another playthrough but...I think if you clear cut an area things will stop spawning? It seemed like anywhere I had built up and cut down most of the trees around, nothing was spawning around there. Outside of events