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An artificial Jungle biome can be created by planting enough jungle grass in one area and letting jungle vegetation grow. Is there a safe way to do this without having enemies spawn? For example if I want a jungle grass farm, will I be safe if I just provide background walls and enclose all the jungle grass, or will the artificial biome extend beyond the walls and allow jungle enemies to spawn outside? How far would the artificial biome extend?

Note: This question is specifically about jungle but may apply to all biomes in general.

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If you want to prevent enemies from spawning in a Jungle biome (artificial or not), build several houses and have NPCs move into them. This is the only reasonable way to fully stop hostile mobs from spawning in general.

Note that during Blood Moons enemies will still spawn, even with NPCs nearby.

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What if I want a farm that is not located near my NPC's? I was planning an underground jungle farm, but gave up on the project because it looked like I would need a box several screens in size to contain a few jungle tiles that take up less than a screen. – jw013 Jun 5 '13 at 15:55
"Mess with the bull, you get the horns." If you want an underground jungle farm, you get to deal with the hostile mobs there. – Gigazelle Jun 6 '13 at 22:32
I'm not sure how that is relevant. I want monsters ... inside the farm. I'm asking where the boundary between inside and outside is so I know how big to make it. – jw013 Jun 7 '13 at 15:01
aaaaah, i thought you were farming stuff like jungle spores and didn't want any hostile mobs. That makes more sense. The actual boundary would be about a screen and a half from where the music changes. – Gigazelle Jun 7 '13 at 16:42

From my experience in playing with Terraria, when you create an artificial biome, the game will treat it as if the biome "exists" to begin with.

The problem with walling your artificial biome is that, the jungle seeds will be unable to "grow". The artificial biome would grow the size you want it to be.

Here is a guide about gardening that could be relevant to you:

If you notice, the objects were grown according to how they are found in the wild, while creating an enclosure to make it easier on you to get the items.

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This is based solely on the fact that it worked once. I needed to be able to farm trees constantly so outside was dangerous. How I made it work is I built the bottom half of the area with stone and the top half with glass allowing sunlight in. The trick was the glass was several layers thick. Starting from ground level and working down. It is realistic but I only bothered to do it once. Over a year ago.

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What does this have to do with preventing monsters from spawning in an artificial jungle biome? – kotekzot May 12 '14 at 13:17

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