[2022] 5m distance to trees

You can find the setting in EcoSim.eco, it is called "MinTreeSpawnDistance": 5.
Please note that the respective entry in the UI is marked with a very clear warning - changing this to lower values can have extreme effects on client performance, especially with tree farms. Changing the value is hence unsupported.

Originally posted by Cosa: Thank you for your answer, i know that tree farms have heavy effects, but the distance of 5m is really annoying from time to time. I will test it some days, thank you :)

It is only a temporary solution anyway, the simulation will later be adapted so that trees that are placed nearer than 5m will simply die, in accordance with initial world generation.

It does not yet kill the trees, as I mentioned above. The placement prevention is a workaround.