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[Terratoch]

I opened up the matgloss_wood raw and changed every biome tag to ALL_MAIN in an effort to see trees grow on mountains and in a desert but to no avail. Is that not the correct file to change, or is it just impossible to change the biomes of trees.

[Aqizzar]

No you got it right.  Trees just won't grow on terrain marked as mountainous, even if it's an allowable biome.

I might me be wrong though.  Did you do this to a gameworld already in progress, or did you generate a new world?  If the latter, it's probably impossible then.

[Terratoch]

But I'm not seeing them appear in deserts either. And yeah, I remember I have to generate a new region every time I change a raw file.

[Osmosis Jones]

Toady has stated trees will only grow in areas with sufficient soil moisture. As deserts are somewhat dry, and mountains probably have very good drainage, I can't see either having the water levels required to grow trees.

[Ascii Kid]

Did you try upping the minimum rainfall amount and capping the drainage?  I'm not sure if this would solve the problem, or if it would just make it so no deserts or mountains appear, but barring either of those it might solve the problem.  Seems to me, tho, that the terrains have a range, so there might be room for play.

[Erom]

You can get trees to grow in desert by playing around with the minimum rainfall and stuff in world gen. Like ascii kid says, the terrains have a range. However, you can't seem to get them to grow on mountains at all - presumably because mountains are hardcoded to not have soil. Sorry. The only time something will grow in a MOUNTAIN biome is a very thin band where the mountain touches the adjacent biome. Sometimes, not all the time, you'll get a 10 or 20 tile wide strip that has soil but is still considered MOUNTAIN. Useful if you, say, wanted to make a rare plant that only grew at the foot of mountains, but useless if you're trying to get alpine forests.

[Ascii Kid]

Could a plateaux be formed inside the elevated terrain of a mountain range that could be considered a different biome?  Ie.  Could you have a mountain-top forrest or lake?  Or is it considered one huge biome reguardless of the features therein.

[Deon]

High mountains are still somewhat dull. I think it can be changed later, but for now mountains are heaps of rock, and no tree can grow on rock. This is not a "hardcoded mountain" problem, this is tied to common min/max drainage and other things in the worldgen parameters. I was able to get sparce forests in a desert but the problem is that if you try to make more real "forests" there the sand is gone due to worldgen parameters. So we just need more expanded idea how the worldgen works and some tweaks from Toady to allow special features like plateaus and lakes on high mountains.

[LegoLord]

Muddy the mountains and deserts and it should work very much like tower cap growth.

[Ascii Kid]

Doesn't that only work for underground/covered plants?  If not, then every mountain-top I build under is going to be a waterfall.  With VERY tired pump opperators.  =->

[beorn080]

Isn't there already a desert based tree. The saguro cactus IIRC.

[roundedge]

my fortress is in a desert with saguaro's

[Jay]

But I'm not seeing them appear in deserts either. And yeah, I remember I have to generate a new region every time I change a raw file.

I swear, Toady REALLY needs to sticky a topic with this.

Changes to tags except for locations (biomes)/entities do not require regeneration.
Changes to locations and pretty much anything in the entity files do.
Adding/removing entire entries or renaming entries will also.

[TettyNullus]

As to questions about trees on mountains, IIRC you need soil layer under the layer that's exposed to light (Correct me if I'm wrong, I've never seen tree on muddied rock tiles yet other than tower-caps underground, and I've flooded my share of rocky areas above and underground ). And deserts, I've never seen trees in the few deserts I've played so far, but occasional bushes so I think it's too dry to support trees in general, and thusly don't shows up much even for desert-type trees.

[Neoskel]

I once played a game in a desert where there were loads and loads of saguaros. In fact, that was my first fortress. I never had to import wood and everything i made was out of wood (had a wicked double aquifer). The aquifer might have had something to do with it.