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[Demonic Spoon]

So yeah, quick question, do trees grow if you make a roof over the ground?

[thijser]

There are 2 groups of trees the first will grow outside on normal soil but won't grow anywhere inside or without soil. These might have grown under your roof but once you build it they will stop growing. The second group only apears if you have opened the caverns and mudied the area. If you have done this then trees will start to grow.

[chewie]

I once accidentally flooded my whole fortress. The whole thing had muddy floors and trees grew all over the place (for example, the dining room).

[Sphalerite]

Aboveground trees grow on indoor tiles, so long as that tile is 'light, aboveground', has a solid unbroken soil under it, and is in a biome where trees grow.  So if you have a patch of surface ground with trees growing on it, trees will still grow on it even if you roof it over.  It's kind of like how you can cover surface ground with a roof yet still grow surface crops on it.

Underground trees, of course, only grow in dark underground tiles.

[Demonic Spoon]

Right thanks, and I was reffering to aboveground trees yes, not subterrean ones, which I know can only grow on subterrean tiles.

[Chocolatemilkgod]

I always get trees in my moat, which means I have to send an expendable volunteer to clean it up.