Mod for Growing Plants Inside?

That happens when you try to plant a tree under a ceiling that will be too low for the full grown tree. The game is preventing problems with the tree clipping into the upper floor/ through the ceiling. Medium height walls should be high enough, or also low walls but with the ceiling knocked out. You can still have a roof over that. With a sloping roof, you may have to find the right spot in the room- it's ok under the peak, but too low under the edges. Roofs can also be pulled into barn or dome shapes, giving you more room under them.

I think as its only the trees that do this under a small room (I grow trees in a med wall greenhouse with no problems), no one will want to mod either all the harvestable trees or all the roofs. None of the little plants like roses fail to germinate in any indoor rooms, or shouldn't do. There was one alien plant that wouldn't grow in a pot no matter what modders did to it, this could have been fixed as it was most commonly complained about after City Living was released.

Apparently so.  But try some different spots.  This screenshot is from Strangerville, the welcome wagon kept trying to plant bizarre fruit in the planters.  The one with the bizarre fruit still in it kept failing to germinate, and I don't see what's wrong with the spot.  The other one planted successfully, but the MiB's have already been here and confiscated it.



And this is just a spare bedroom with planters in it.  Normal ceiling, small wall height.