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[it_is_coming]

I want to try to make a tower cap farm, but I read somewhere that you need an underground river. Does this mean that it won't work if I just use water from my reservoir? Does an underground body of water have to be present for tower caps to grow?

[Tormy]

Check out the wiki, it's quite useful.  Click!

[it_is_coming]

I read that article, but I'm on a map with no underground water, and I want to know if I can still grow tower caps.

[Serg]

No, because when you discover an underground lake/river it 'flips the switch' for tower caps to grow.

[sdu]

Yeah you have to have an underground water source, pool or river, and discover it before you will get tower caps growing.

[SolarShado]

But after you discover the river/pool, any (undergound) muddy tile can grow tower caps, regardless of what water mudied it. (or so i have read)

[Agent Fransis]

But after you discover the river/pool, any (undergound) muddy tile can grow tower caps, regardless of what water mudied it. (or so i have read)

I can confirm that.

[TettyNullus]

But after you discover the river/pool, any (undergound) muddy tile can grow tower caps, regardless of what water mudied it. (or so i have read)

I can confirm that.

Personally can verify to it also, I've used underground river, and collpased surface brooks and rivers to flood underground for tower-caps. All needed is mud, underground, and finding underground river or pool. They even grows underwater, at least in 3/7 and less flowing water. (ps: make sure you have flood control installed if you tries to use any water sources that constantly flows )

[Agent Fransis]

I personally use a sectioned tree farm, each section cut-offable by a raising bridge, and above each I have a hatch (retracting bridge) with water tunnels and additional flow regulation bridges running in a grid above the farms. I suggest using at least 3 tile wide channels for large farms, so irrigation won't take forever. Also, a good idea will be installing in advance a means to shut off the water flow and drain the water from the system, for maintenance (namely tower caps growing in your tubes or corpses falling into them) or expansion.

[lucinthus]

You dont even need to irrigate. if its loamy soil that you can build a farm on just by digging it out, it will grow tower caps. 

[toast]

You dont even need to irrigate. if its loamy soil that you can build a farm on just by digging it out, it will grow tower caps. 

eeee i dont think so. pretty sure thats wrong actually.

[LegacyCWAL]

You dont even need to irrigate. if its loamy soil that you can build a farm on just by digging it out, it will grow tower caps. 

eeee i dont think so. pretty sure thats wrong actually.

Nope, I've got a fort going right now that has tower-caps growing in unirrigated soil.  They aren't exactly thriving for some reason, but they're there.

[TettyNullus]

You dont even need to irrigate. if its loamy soil that you can build a farm on just by digging it out, it will grow tower caps. 

eeee i dont think so. pretty sure thats wrong actually.

Nope, I've got a fort going right now that has tower-caps growing in unirrigated soil.  They aren't exactly thriving for some reason, but they're there.

Can confirm it's happened to me too, but they rarely lasts long, if at all, mostly due to traffic, I suspect. Looks like it don't sprout up as often on soil as on muddied rocks for some reason.

[LegoLord]

You dont even need to irrigate. if its loamy soil that you can build a farm on just by digging it out, it will grow tower caps. 

eeee i dont think so. pretty sure thats wrong actually.

Nope, I've got a fort going right now that has tower-caps growing in unirrigated soil.  They aren't exactly thriving for some reason, but they're there.

Can confirm it's happened to me too, but they rarely lasts long, if at all, mostly due to traffic, I suspect. Looks like it don't sprout up as often on soil as on muddied rocks for some reason.

I had dug out a large area of soil for an underground tree farm.  They didn't start growing imediately, but eventually they started sprouting at the same rate as the muddied tree farm on the other side of the map.  I think tower cap spawning is related to moisture.  Muddied tiles are, obviously, moist, and would be more likely to grow towercaps.  The soil was under a swamp, so it too would be fairly moist.  It is likely that your soil is not from a moist biome, especially if the above-ground trees are sparse or only lightly wooded.  Moisture is a feature that we know exists but are not sure how it works.  So that is my guess.

[TettyNullus]

I had dug out a large area of soil for an underground tree farm.  They didn't start growing imediately, but eventually they started sprouting at the same rate as the muddied tree farm on the other side of the map.  I think tower cap spawning is related to moisture.  Muddied tiles are, obviously, moist, and would be more likely to grow towercaps.  The soil was under a swamp, so it too would be fairly moist.  It is likely that your soil is not from a moist biome, especially if the above-ground trees are sparse or only lightly wooded.  Moisture is a feature that we know exists but are not sure how it works.  So that is my guess.

Maybe it works differently underground rather? In most of the areas I've grown treecaps, the tree aboveground was sprouting almost everywhere, and rather thickly too. To the point I had to actually build a roadway to edge so carvans don't get lost