Lush Caves

A lush cave is a temperate Overworld biome that has an unique fauna and flora and is found underground below azalea trees.

Description
Overground, the biome resembles a hillier plains biome (with the same dull aqua foliage color from an ocean in Java Edition and the same light green color from mushroom fields biomes in Bedrock Edition). Azalea trees generate on any empty space above a lush cave, with roots consisting of rooted dirt and hanging roots that generate down until reaching the lush cave. This is most common at the surface, but they can sometimes generate inside caves if there is enough room and a lush cave below.

Underground, moss covers the floors and ceilings, along with moss carpets, grass, and azalea bushes on the floors. On the ceiling, cave vines with glow berries grow down and light up the caves, and spore blossoms grow from the ceiling and drip particles. It also contains clay lakes where dripleaf plants grow out of them.

$$, lush caves are not part of the terrain generator, and can only be generated in a Buffet world with lush caves selected, or in a Custom world.

$$, lush caves generated rarely and randomly in caves if the Experimental Gameplay feature was turned on in 1.17 betas.

Bats, glow squid and axolotls are the only passive mobs that spawn.

Java Edition generation
Lush caves include all standard Overworld biome features, as well as the "patch_tall_grass_2", "glow_lichen", "lush_caves_ceiling_vegetation", "cave_vines", "lush_caves_clay", "lush_caves_vegetation", "rooted_azalea_trees", "minecraft:spore_blossom", and "minecraft:classic_vines_cave_feature" features. Ambient cave noises are not played in this biome. Lush caves use the same sky color as the river biome. Players cannot spawn in a lush caves biome. The biome's downfall value is 0.5 and its depth value is 0.1. It is classified as an underground biome.

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Trivia

 * Swedish painter was one of the main inspirations behind the design and idea of the lush caves biome, specifically Bauer's 'Oskuldens Vandring' (Innocent's Journey) painting.
 * During development, lush caves contained calcite.
 * Also during development, Agnes Larsson made a mistake and made lush caves generate absolutely everywhere.