I reviewed the code and conducted a test that seems to show that setup working correctly. I can provide instructions for how to verify it working with the scene explorer mod. Is it possible there is some other mechanic that is killing the trees? I just saw a new mod show up related to preventing trees from dying from pollution. I do know that plants and trees have a pollution counter, but haven’t seen it increase or know what it does. Haven’t spent anytime investigating that.Im also having the same issue as the other poster. I'm having some trees dying with growth disabled. I'm not sure what's causing it. I have disasters disabled.