Guide:Artificial biomes

Artificial biomes are player-constructed biomes that will spawn the monsters and provide access to most of the other materials that this biome provides. Only certain biomes can be artificially constructed. These are useful for building gardens or otherwise farming for certain items. This guide will explain how to build such biomes.

Some biomes can be constructed within virtually any Layer, at any depth, while others have specific depth requirements. With the exception of the Meteorite biome, no biome will override the Underworld. Any biomes not mentioned below cannot be constructed artificially.

Forest
A Forest biome is the default biome for the Surface layer. When none of the other conditions for a biome are currently fulfilled on the surface, then it is a forest biome.

A more proper forest can be grown by planting Grass Seeds on Dirt blocks. Trees can be grown with Acorns.

Deserts
A Desert biome is defined by the presence of sufficient Sand blocks, in any Layer except the Underworld. Even a single block of sand can spawn desert enemies, as well as grow Cactus and Waterleaf. Deserts can be within any layer. It requires many blocks of sand to change the background into the desert background, and the presence of sufficient other biome-defining blocks on-screen will override this background.

A flat strip of sand, one block in height, is sufficient to be considered an artificial desert biome suitable for harvesting various Desert materials.

Hallowed/Corrupted deserts can be constructed from pearl/ebonsand in Hardmode.

Surface jungle
The Surface Jungle biome is defined by the presence of Jungle Grass on Mud blocks, but only on the Surface layer. Jungle Grass will cause the spawning of surface jungle enemies. 150 blocks of Jungle Grass are needed to change the background and music into the Jungle biome's natural music and background.

Underground jungle
The Underground Jungle biome is defined by the presence of Jungle Grass on Mud blocks in the Underground or Cavern layers below a certain depth. Which depth this is depends on the Map's size:

You can tell the difference between Jungle in the underground and true Underground Jungle by what monsters spawn and whether Jungle Spores grow naturally. If Hornets are spawning or Jungle Spores are visible, then it is a true Underground Jungle.

Ocean
An Ocean biome is defined by all of the following conditions:


 * The floor must be made of Sand at least one block thick. Pearl/Ebonsand do not count.
 * There must be 7 or more blocks of water above the sand.
 * This must be positioned within 250 blocks of either edge of the map.
 * This must be above a depth of 0, so within the Surface or Space layers.

This environment will grow Corals and spawn Ocean monsters.

Hallow and Corruption
The Hallow and Corruption biomes are defined by the presence of their respective hallowed and corrupted blocks, in any layer other than the Underworld. Sufficient Hallowed Grass, Pearlstone, and Pearlsand defines the Hallow, and sufficient Corrupt Grass, Ebonstone, and Ebonsand defines the Corruption.

Note that if the world is pre-Hardmode, an artificial Hallow biome will not spawn its usual monsters; it will spawn Forest monsters instead.

Meteorite
The presence of 50 meteroite ore on the screen will transform any environment into a Meteorite (biome) biome. All naturally-occurring enemy spawns will be replaced with Meteor Heads, unless this is done in the ocean biome. This works even in the Underworld.