If the hallow "spawns" in the jungle...

[i am god]

Will it spread? Except the different water and music, I don't see many hallow-things, like grass or anything. Will that biome go to waste..?

[JonJaded]

It shouldn't, but if you PHYSICALLY put it there, it will.

[i am god]

...What do you mean by that?

[T]

You can use Holy Water to spread Hallow wherever you want. 2 Pixie Dust + 10 Bottled Water + Hallowed Seeds = 10 Holy Water's

[I'm so confused]

The percentage of that spawning in the jungle is pretty low in my opinion but if it DOES happen, It wont spread too much as hollow will not spread through mud unlike the crimson or corruption biome. As for the biome going to waste , if the hallow took maybe 3/4 of the jungle area then yes its a waste until you cleanse it.

[BOT]

Hallow Can't spread to mud unless you force it to, I think the Clentaminator and Holy Water will forcespread it onto the jungle.

Unlike the Hallow, Crimson and Corruption will not hestitate to spread into the jungle post-WoF. just at a much slower rate then normally.

[i am god]

Oh, alright.
It DID spawn in my jungle, hence the question - I suppose it was able to do so because of the few sand blocks that were present. Thanks!

[Ͽ҈҉Ͼ]

When you kill WoF, several diagnoal stripes of terrain will be made hollow or corrupt. Additionally, every time you break an altar more parts of your world will become hollow or corrupt. If you take too long beating the mechanical bosses and have bad luck, large portions of your jungle, if not the whole thing, can eventually become corrupted. Naturally, having corruption or crimson initially spawn smack in the middle of your jungle will make it more likely that the only surviving portions would be deep underground.