Diversitree

Also includes an option to plant trees on landfill, which is arguably more useful than the rest of it combined.

This mod makes forests planted on Nauvis look more like naturally growing forests, with much more diversity in the types of trees that appear. It works with both hand-planted seeds and seeds planted by the agricultural tower. It does not use on_tick events or any sort of polling, so its impact on UPS should be minimal.

This mod also includes a setting to make trees immune to pollution, so you can pollute all you want and keep your pretty forests intact.