The automatic spreading of trees is a cool and important feature of the ecosystem, but sometimes it can be super annoying. It almost feel that trees are “attacking” your base and nature wants to take over.
It’s actually a cool mechanic, yet there should be something else that you can do about it other than to cut small trees all the time.
I finally developed a solution for that – use the fences or walls to control it. Here is a short video explaining how: