I am experiencing this issue on my server now. The south is almost completely empty with the exception of a couple trees and a bunch of undergrowth. All of the Oaks disappeared on the map first. We first noticed it when all of the high quality ones left and we were left with only 10q oaks anywhere you went. A couple days later, those were gone also. Apples trees followed soon after and now other trees are gone also. As every in game day progresses the tree problem gets worse.
I have seen fixes for this but I can no longer find much on it at all and the only fix I did find hasn't worked. If anyone has any suggestions that would be excellent as this is killing my population. No one wants to play on a server that has no trees.
Also, when we started the server, I had set the tree growth to 5. Please note that in the file it states that anything above 10 will likely result in the balance never being reached.
Any help would be nice and this issue needs to be fixed as it is happening on all of the YO servers.