I'm pretty far in, and I'm a little afraid to now switch the settings to one of the landfills. Not a big fan of having to use stone to place grass, either. If you could use all that extra wood to make some mulch, on the other hand. wink which would then slowly turn the grass and the surrounding area more fertile.. wink the same as when you place a seed in the ground and wait for it to turn into a tree wink water could also be used in the recipe, if that makes it more realistic. Way more so than using stone. Which would realistically just result in wet gravel path on which nothing will grow naturally.
Just some random thoughts from a gardener, though! ;)

Hell, I'd already be fine with the thought of it not placing any grass on top. Just as long as we get something that can be placed by robots, as they seem like amazing brushes for terraforming.