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[Firnagzen]

Um, could someone confirm this for me? Towercaps only grow when you've found an underground river or pool?

[Michaelsoftman]

Yes, and I believe you also have to get some underground soil muddy for them to grow.

[Firnagzen]

Blast. I'd just dug out a huge area, too.

Ah, well, thanks.

[Martin]

Yes, and I believe you also have to get some underground soil muddy for them to grow.

Actually, you don't.

As soon as you tap the underground pool or river, towercaps will start growing on any subterranean soil. No need to muddy at all.

[userpay]

Yes, and I believe you also have to get some underground soil muddy for them to grow.

Actually, you don't.

As soon as you tap the underground pool or river, towercaps will start growing on any subterranean soil. No need to muddy at all.

While I've never done it I'm pretty sure it does have to be muddied.

[Vactor]

Underground Soil - doesn't need to be muddied
Underground Rock - needs to be muddied

and yes in all cases you need to discover an underground river or pool

[Martin]

While I've never done it I'm pretty sure it does have to be muddied.

Stone floors need to be muddied, but soil ones don't. My current map has subterranean soil in several places and within a month of tapping the underground river they were all growing tower caps - even 150 tiles away and 10 z-levels up.

[zchris13]

While I've never done it I'm pretty sure it does have to be muddied.

Stone floors need to be muddied, but soil ones don't. My current map has subterranean soil in several places and within a month of tapping the underground river they were all growing tower caps - even 150 tiles away and 10 z-levels up.

This is what we just said. Nice one.  I totally agree with this.

[Albedo]

Underground Soil - doesn't need to be muddied
Underground Rock - needs to be muddied

However, whenever I have muddied soil and unmuddied side by side, I can see a HUGE difference in density of production.  Massive diff. Like 10:1, maybe more. 

They will grow on unmuddied soil, but they love muddied much better.  (Also remember TC saplings die easily when trampled - I use <d, o, r> and click each sapling to create it's own "no-go" zone.

[Narmio]

Additionally, young tower caps will not mature into full tower-caps if there is something in their square.  I only discovered this after my saplings weren't maturing in my first mushroom farm after three years - except one or two in the squares stones had been removed from.  So you've got to dump out your loose stone in addition to muddying up stone shroom-farms.

[Derakon]

I believe I remember Toady saying that plants track local availability of water when deciding whether or not to grow, so it would make some sense that muddying the ground encourages growth. Dunno if there's any kind of stacking effect when using muddied soil vs. muddied rock.

[Martin]

Muddying may help, I haven't tested that. Another thing that helps is clearing shrubs. Density is governed by *all* plant life, so if you gather the plants, eventually only tower caps will remain. And as albedo said, do it with minimal trampling.

[Albedo]

Density is governed by *all* plant life, so if you gather the plants, eventually only tower caps will remain.

Are you saying they compete? wow, never thought of that possibility.

[Martin]

Density is governed by *all* plant life, so if you gather the plants, eventually only tower caps will remain.

Are you saying they compete? wow, never thought of that possibility.

Yes, they absolutely do. After about 20 years of running Moruls' fort, outdoor trees wouldn't grow anymore. I hadn't gathered any plants but kept cutting trees about every 3 years, so when an opportunity for something to grow presented, there was a chance it'd be a shrub and not a tree. Over time, shrubs dominated the map and trees (essentially) wouldn't grow any more. I sent most of the fortress out and gathered the entire map of plants and now the map is almost entirely trees.

That's true both above and below ground.

[Leafsnail]

Do you actually need to strike the river (and flood somewhere) or just find it?  I've found an underground damp wall, but no random towercaps yet.