Mutations

Mutations

Mutation is how you climb the tree: two mushrooms of the right kinds, planted close together, can create a new mushroom between them. Parents are not consumed, so a well-built mutation farm keeps producing.

How it works

1. A mushroom finishes growing.
2. It looks for another fully grown mushroom within 2 blocks (a 5x5 area at the same height).
3. If the pair of mushrooms matches a mutation recipe (the order does not matter), the game checks for a free spot.
4. The new mushroom needs a free block that is:
   • next to both parents (within 1 block of each),
   • air, at the same height as the parents, standing on a spore soil,
   • dark: light level 7 or less.
5. If a spot exists, there is one roll with the mutation's chance. On success the new mushroom appears at its first growth stage.

If no spot is available, nothing happens. The chance is rolled each time the growing mushroom matures, so patience (and many mushrooms) pays off.

Tip: with Jade, look at a mushroom to see which mutation it can trigger, its chance, and why it is blocked (too bright or no free spore soil).

Building a mutation farm

• Plant parents A and B with one free spore soil block next to both of them.
• Keep the area dark (light 7 or less at the free spot).
• Surround the farm with harvesters if you want automatic production. Harvesting resets a mushroom, which then matures again and rolls a new chance.
• Use accelerators and good soil: faster growth means more rolls per hour.

The tree

27 mushrooms can be obtained by mutation. The 6 base mushrooms (Dirt, Gravel, Ice, Netherrack, Sand, Stone) are the roots of the tree and are made at the Altar.

Result	Parent A	Parent B	Chance
Blackstone	Stone	Netherrack	6%
Clay	Dirt	Sand	10%
Iron	Gravel	Stone	6%
Moss	Dirt	Ice	10%
Obsidian	Ice	Netherrack	5%
Quartz	Sand	Stone	6%
Soul Sand	Sand	Netherrack	6%
Amethyst	Quartz	Iron	4%
Basalt	Blackstone	Gravel	6%
Calcite	Quartz	Clay	6%
Coal	Moss	Stone	8%
Copper	Clay	Gravel	6%
End Stone	Obsidian	Sand	3%
Fungalsteel	Moss	Iron	4%
Glowstone	Quartz	Netherrack	4%
Lapis Lazuli	Ice	Quartz	4%
Tuff	Stone	Clay	8%
Deepslate	Stone	Coal	8%
Diamond	Coal	Obsidian	4%
Flint	Gravel	Coal	8%
Gold	Iron	Glowstone	4%
Magma	Netherrack	Coal	6%
Redstone	Copper	Glowstone	4%
Emerald	Diamond	Lapis Lazuli	3%
Netherite	Diamond	Magma	2%
Sculk	Soul Sand	Deepslate	4%
Echo Shard	Sculk	Amethyst	3%

A roll happens each time a parent matures, so even a 4% mutation triggers regularly in a large farm.

Mutation depth

Tier	Mushrooms
1	Dirt, Gravel, Ice, Netherrack, Sand, Stone
2	Blackstone, Clay, Iron, Moss, Obsidian, Quartz, Soul Sand
3	Amethyst, Basalt, Calcite, Coal, Copper, End Stone, Fungalsteel, Glowstone, Lapis Lazuli, Tuff
4	Deepslate, Diamond, Flint, Gold, Magma, Redstone
5	Emerald, Netherite, Sculk
6	Echo Shard

Looking for a specific mushroom? In JEI, look up the mushroom and open its Mutation recipe.