Where do the robots automatically plant new trees?

Or do they only replace chopped trees I planted manually in the first place?
If so, could you please make a possibility or setting to determine where new trees should automaticly be planted? Maybe a tile like 'Fertile Soil' used in the 'Fish and Wildlife'-Mod or something similar to give the robots an area where they should plant a forest. Doing this by hand is just not an option for me to get my railways surrounded by a strip of forest...

You can blueprint the seeds.

I usually have a blueprint of 32x32 tiles full of seed and place it where i need it.

I recommend you to use the Edit-Blueprints mod by V453000.
It makes blueprint making and eaditing so much easier.

Thank you a lot, that works great!

No problem.

If you need anything else I'm here to help.